Indoor lighting power and allowable lighting power methods

Grounded in the retrieved California Energy Code — click a citation to read the verbatim passage:

• § 0.80. High relevance — show source text

  B. Small aperture tunable-white and dim-to-warm luminaires lighting power adjustment. For qualifying small aperture tunable-white and dim-to-warm LED luminaires, the adjusted indoor lighting power of these luminaires shall be calculated by multiplying their maximum rated wattage by 0.80. Qualifying luminaires shall meet all of the following: i. Small aperture. Qualifying luminaires with a luminaire aperture length longer than 18 inches shall have a luminaire aperture no wider than four inches. Qualifying luminaires with a luminaire aperture length of 18 inches or less shall have a luminaire aperture no wider than eight inches. ii. Color changing. qualifying tunable-white luminaires shall be capable of a color change greater than or equal to 2,000 Kelvin correlated color temperature (CCT). Qualifying dim-to-warm luminaires shall be capable of color change greater than or equal to 500 Kelvin CCT. iii. Controls. Qualifying luminaires shall be connected to controls that allows color changing of the luminaires.

  132 2025 CALIFORNIA ENERGY CODE

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  NONRESIDENTIAL AND HOTEL/MOTEL OCCUPANCIES—PERFORMANCE AND PRESCRIPTIVE

  COMPLIANCE APPROACHES FOR ACHIEVING ENERGY EFFICIENCY

  (b) Calculation of allowed indoor lighting power: general rules.

  1. The allowed indoor lighting power allotment for conditioned areas shall be calculated separately from the allowed lighting power allotment for unconditioned areas. Each allotment is applicable solely to the area to which it applies, and there shall be no trade-offs between conditioned and unconditioned area allotments.

  2. Allowed indoor lighting power allotment shall be calculated separately from the allowed outdoor lighting power allotment. Each allotment is applicable solely to the area to which it applies, and there shall be no trade-offs between the separate indoor and outdoor allotments.

  3. The allowed indoor lighting power density allotment for general lighting shall be calculated as follows: A. The complete building method, as described in Section 140.6(c)1, shall be used only for an entire building, except as permitted by Section 140.6(c)1. As described more fully in Section 140.6(c)1, and subject to the adjustments listed there, the allowed indoor lighting power allotment for general lighting for the entire building shall be calculated as follows: i. For a conditioned building, the product of the square feet of conditioned space of the building times the applicable allotment of watts per square foot described in Table 140.6-B. ii. For an unconditioned building, the product of the square foot of unconditioned space of the building times the applicable allotment of watts per square feet described in Table 140.6-B.

• § 160.5 High relevance — show source text

  Unitary system serving one dwelling unit
  5. Central system serving multiple dwelling units|

  (e) Lighting. Dwelling unit lighting shall meet the applicable mandatory requirements of Section 160.5(a). Common use area lighting shall meet the following requirements:

  Exception to Section 170.2(e): Common use areas providing shared provisions for living, eating, cooking or sanitation to dwelling units that would otherwise lack these provisions may instead comply with Section 160.5(a).

  1. Interior common use area lighting. A building complies with Section 170.2(e)1 if: A. The calculation of adjusted indoor lighting power of all proposed building areas combined, calculated under Subsection 170.2(e)2, is no greater than the calculation of allowed indoor lighting power, specific methodologies calculated under Subsection 170.2(e)4; and B. The calculation of allowed indoor lighting power, general rules comply with Subsection 170.2(e)3. The prescriptive limits on indoor lighting power are the smaller of the actual and allowed indoor lighting power values determined in accordance with Item A.

  2. Calculation of Adjusted Indoor Lighting Power. The Adjusted Indoor Lighting Power of all proposed building areas is the total watts of all planned permanent and portable lighting systems in all areas of the proposed building; subject to the applicable adjustments under Subdivisions A through D of this subsection. A. Two interlocked lighting systems : No more than two lighting systems may be used for an area, and if there are two they must be interlocked. Where there are two interlocked lighting systems, the watts of the lower wattage system may be excluded from the Adjusted Indoor Lighting Power if: i. An installation certificate detailing compliance with Section 170.2(e)1A is submitted in accordance with Section 10-103 and Section 160.5(e); and ii. The area (or areas) served by the interlocking systems is an auditorium, a conference room, a multipurpose room or a theater; and

  iii. The two lighting systems are interlocked with a nonprogrammable double-throw switch to prevent simultaneous operation of both systems.

  258 2025 CALIFORNIA ENERGY CODE

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  MULTIFAMILY BUILDINGS—PERFORMANCE AND PRESCRIPTIVE COMPLIANCE APPROACHES

  For compliance with Part 6, a nonprogrammable double-throw switch is an electrical switch commonly called a “single pole double throw” or “three-way” switch that is wired as a selector switch allowing one of two loads to be enabled. It can be a line voltage switch or a low voltage switch selecting between two relays. It cannot be overridden or changed in any manner that would permit both loads to operate simultaneously. B. Reduction of wattage through controls. In calculating Adjusted Indoor Lighting Power, the installed watts of a luminaire providing general lighting in an area listed in Table 170.2-L may be reduced by the product of (i) the number of watts controlled as described in Table 170.2-L, times (ii) the applicable power adjustment factor (PAF), if all of the following conditions are met: i. An installation certificate is submitted in accordance with Section 160.5(e)2; and ii. Luminaires and controls meet the applicable requirements of Section 110.9 and Sections 160.5(b) through 160.6; and

  iii. The controlled lighting is permanently installed general lighting systems and the controls are permanently installed nonresidential-rated lighting controls.

• § 140.6 High relevance — show source text

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  NONRESIDENTIAL AND HOTEL/MOTEL OCCUPANCIES—PERFORMANCE AND PRESCRIPTIVE

  COMPLIANCE APPROACHES FOR ACHIEVING ENERGY EFFICIENCY

  (b) Calculation of allowed indoor lighting power: general rules.

  1. The allowed indoor lighting power allotment for conditioned areas shall be calculated separately from the allowed lighting power allotment for unconditioned areas. Each allotment is applicable solely to the area to which it applies, and there shall be no trade-offs between conditioned and unconditioned area allotments.

  2. Allowed indoor lighting power allotment shall be calculated separately from the allowed outdoor lighting power allotment. Each allotment is applicable solely to the area to which it applies, and there shall be no trade-offs between the separate indoor and outdoor allotments.

  3. The allowed indoor lighting power density allotment for general lighting shall be calculated as follows: A. The complete building method, as described in Section 140.6(c)1, shall be used only for an entire building, except as permitted by Section 140.6(c)1. As described more fully in Section 140.6(c)1, and subject to the adjustments listed there, the allowed indoor lighting power allotment for general lighting for the entire building shall be calculated as follows: i. For a conditioned building, the product of the square feet of conditioned space of the building times the applicable allotment of watts per square foot described in Table 140.6-B. ii. For an unconditioned building, the product of the square foot of unconditioned space of the building times the applicable allotment of watts per square feet described in Table 140.6-B.

  TABLE 140.6-B—COMPLETE BUILDING METHOD LIGHTING POWER DENSITY VALUES	Col2
  TYPE OF BUILDING	ALLOWED LIGHTING POWER DENSITY ** (WATTS PER SQUARE FOOT)**
  Assembly building	0.65
  Bank or financial institution building	0.65
  Grocery store building	0.90
  Gymnasium building	0.60
  Healthcare facility	0.90
  Industrial/manufacturing facility building	0.60
  Library building	0.70
  Motion picture theater building	0.60
  Museum building	0.65
  Office building	0.60
  Parking garage building	0.13
  Performing arts theater building	0.75
  Religious facility building	0.70
  Restaurant building	0.65
  Retail store building	0.90
  School building	0.60
  Sports arena building	0.75
  All other buildings	0.40

  B. The area category method, as described in Section 140.6(c)2, shall be used for all areas in the building. Under the area category method, as described more fully in Section 140.6(c)2, and subject to the adjustments listed there, the allowed indoor lighting power allotment for general lighting shall be calculated for each area in the building as follows:

• § 140.6 High relevance — show source text

  Mixed occupancy buildings where one type of use makes up at least 90 percent of the entire building (in which case, when applying the complete building method, it shall be assumed that the primary use is 100 percent of the building); or iii. A tenant space where one type of use makes up at least 90 percent of the entire tenant space (in which case, when applying the complete building method, it shall be assumed that the primary use is 100 percent of the tenant space). C. The complete building method shall be used only when the applicant is applying for a lighting permit and submits plans and specifications for the entire building or the entire tenant space. D. Under the complete building method, the allowed indoor lighting power allotment is the lighting power density value times the floor area of the entire building. E. For buildings including a parking garage plus another type of use listed in Table 140.6-B, the parking garage portion of the building and other type of use portion of the building shall each separately use the Complete Building Method. 2. Area category method. Requirements for using the area category method include all of the following: A. The area category method shall be used only for primary function areas, as defined in Section 100.1, that are listed in Table 140.6-C. For primary function areas not listed, selection of a reasonably equivalent type shall be permitted. B. Primary function areas in Table 140.6-C shall not apply to a complete building. Each primary function area shall be determined as a separate area. C. For purposes of compliance with Section 140.6(c)2, an “area” shall be defined as all contiguous areas that accommodate or are associated with a single primary function area listed in Table 146.0-C. D. Where areas are bounded or separated by interior partitions, the floor area occupied by those interior partitions may be included in primary function area. E. If at the time of permitting for a newly constructed building, a tenant is not identified for a multitenant area, a maximum of 0.4 watts per square foot shall be allowed for the lighting in each area in which a tenant has not been identified. The area shall be classified as unleased tenant area.

  F. Under the area category method, the allowed indoor lighting power for each primary function area is the lighting power density value in Table 140.6-C times the square feet of the primary function area. The total allowed indoor lighting power density for the building is the sum of all allowed indoor lighting powers densities for all areas in the building. G. In addition to the allowed indoor lighting power calculated according to Sections 140.6(c)2A through F, the building may add additional lighting power allowances for qualifying lighting systems as specified in the Qualifying Lighting Systems column in Table 140.6-C under the following conditions: i. Only primary function areas having a lighting system as specified in the Qualifying Lighting Systems column in Table 140.6-C and in accordance with the corresponding footnote of the table shall qualify for the additional lighting power allowances; and ii. The additional lighting power allowances shall be used only if the plans clearly identify all applicable task areas and the lighting equipment designed to illuminate these tasks; and iii. Tasks that are performed less than two hours per day or poor quality tasks that can be improved are not eligible for the additional lighting power allowances; and iv. The additional lighting power allowances shall not utilize any type of luminaires that are used for general lighting in the building; and v. The additional lighting power allowances shall not be used when using the complete building method; and vi.

• § 140.6 High relevance — show source text

  Class IV facility is normally used for recreational play and there is limited or no provision for spectators.
  14. The additional videoconferencing lighting power shall be allowed provided the videoconferencing studio meets all the requirements of Section 140.6(c)2Gvii.|

  136 2025 CALIFORNIA ENERGY CODE

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  NONRESIDENTIAL AND HOTEL/MOTEL OCCUPANCIES—PERFORMANCE AND PRESCRIPTIVE

  COMPLIANCE APPROACHES FOR ACHIEVING ENERGY EFFICIENCY

  4. Allowed indoor lighting power allotments for all lighting power allotments other than general lighting shall be restricted as follows:

  When using the area category method, allowed indoor lighting power allotments for specialized task work, precision commercial and industrial work, white board or chalk board, accent, display, decorative, videoconferencing studio, wall display, floor display, task, or very valuable display case, may not be increased as a result of, or otherwise traded off against, decreasing any other allotment.

  (c) Calculation of allowed indoor lighting power: specific methodologies. The allowed indoor lighting power for each building type, or each primary function area shall be calculated using only one of the methods in Subsection 1 or 2 below as applicable.

  1. Complete building method. Requirements for using the complete building method include all of the following: A. The complete building method shall be used only for building types, as defined in Section 100.1, that are specifically listed in Table 140.6-B. (For example, retail and wholesale stores, hotel/motel, and high-rise residential buildings shall not use this method.)

  B. The complete building method shall be used only on projects involving: i. Entire buildings with one type of use occupancy; or ii. Mixed occupancy buildings where one type of use makes up at least 90 percent of the entire building (in which case, when applying the complete building method, it shall be assumed that the primary use is 100 percent of the building); or iii. A tenant space where one type of use makes up at least 90 percent of the entire tenant space (in which case, when applying the complete building method, it shall be assumed that the primary use is 100 percent of the tenant space). C. The complete building method shall be used only when the applicant is applying for a lighting permit and submits plans and specifications for the entire building or the entire tenant space. D. Under the complete building method, the allowed indoor lighting power allotment is the lighting power density value times the floor area of the entire building. E. For buildings including a parking garage plus another type of use listed in Table 140.6-B, the parking garage portion of the building and other type of use portion of the building shall each separately use the Complete Building Method. 2. Area category method. Requirements for using the area category method include all of the following: A. The area category method shall be used only for primary function areas, as defined in Section 100.1, that are listed in Table 140.6-C. For primary function areas not listed, selection of a reasonably equivalent type shall be permitted. B. Primary function areas in Table 140.6-C shall not apply to a complete building. Each primary function area shall be determined as a separate area. C. For purposes of compliance with Section 140.6(c)2, an “area” shall be defined as all contiguous areas that accommodate or are associated with a single primary function area listed in Table 146.0-C.

• § 100.1 High relevance — show source text

  The allowed indoor lighting power allotment for general lighting for one area for which the Area Category Method was used may be increased up to the amount that the allowed indoor lighting power allotment for general lighting for another area using the Area Category Method, except that such increases and decreases shall not be made between conditioned and unconditioned space. D. Additional lighting power allowances other than general lighting power allowances shall be restricted when using the Area Category Method. Additional lighting power allowances for display, decorative, wall display, floor display, or task, may not be increased as a result of, or otherwise traded off against, decreasing any other allotment. 4. Calculation of allowed indoor lighting power: specific methodologies. The allowed indoor lighting power for each common use primary function area shall be calculated using the following method. A. Area Category Method. Requirements for using the Area Category Method include all of the following: i. The Area Category Method shall be used only for primary function areas, as defined in Section 100.1, that are listed in Table 170.2-M. For primary function areas not listed, selection of a reasonably equivalent type shall be permitted. ii. For purposes of compliance with Section 170.2(e)4A, an “area” shall be defined as all contiguous areas that accommodate or are associated with a single primary function area listed in Table 170.2-M. iii. Where areas are bounded or separated by interior partitions, the floor area occupied by those interior partitions may be included in a primary function area. iv. The allowed indoor lighting power for each primary function area is the Lighting Power Density value in Table 170.2-M times the square feet of the primary function area. The total allowed indoor lighting power for the building is the sum of all allowed indoor lighting power for all areas in the building. v. In addition to the allowed indoor lighting power calculated according to Sections 170.2(e)4Ai through iv, the building may add additional lighting power allowances for qualifying lighting systems as specified in the Qualifying Lighting Systems column in Table 170.2-M under the following conditions: a. Only primary function areas having a lighting system as specified in the Qualifying Lighting Systems column in Table 170.2-M and in accordance with the corresponding footnote of the table shall qualify for the additional lighting power allowances; and

  2025 CALIFORNIA ENERGY CODE 261

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  MULTIFAMILY BUILDINGS—PERFORMANCE AND PRESCRIPTIVE COMPLIANCE APPROACHES

  b. The additional lighting power allowances shall be used only if the plans clearly identify all applicable task areas and the lighting equipment designed to illuminate these tasks; and c. Tasks that are performed less than 2 hours per day or poor quality tasks that can be improved are not eligible for the additional lighting power allowances; and d. The additional lighting power allowances shall not utilize any type of luminaires that are used for general lighting in the building; and e. Reserved; and

  f. The additional lighting power allowed is the smaller of: I. the lighting power density listed in the “Allowed Additional Lighting LPD” column in Table 170.2-M, times the square feet of the primary function, or II. the adjusted indoor lighting power of the applicable lighting; and g. Floor displays shall not qualify for wall display allowances. h. Qualifying wall lighting shall: I. Be mounted within 10 feet of the wall having the wall display.

• § 140.6 High relevance — show source text

  ii. For an unconditioned building, the product of the square foot of unconditioned space of the building times the applicable allotment of watts per square feet described in Table 140.6-B.

  TABLE 140.6-B—COMPLETE BUILDING METHOD LIGHTING POWER DENSITY VALUES	Col2
  TYPE OF BUILDING	ALLOWED LIGHTING POWER DENSITY ** (WATTS PER SQUARE FOOT)**
  Assembly building	0.65
  Bank or financial institution building	0.65
  Grocery store building	0.90
  Gymnasium building	0.60
  Healthcare facility	0.90
  Industrial/manufacturing facility building	0.60
  Library building	0.70
  Motion picture theater building	0.60
  Museum building	0.65
  Office building	0.60
  Parking garage building	0.13
  Performing arts theater building	0.75
  Religious facility building	0.70
  Restaurant building	0.65
  Retail store building	0.90
  School building	0.60
  Sports arena building	0.75
  All other buildings	0.40

  B. The area category method, as described in Section 140.6(c)2, shall be used for all areas in the building. Under the area category method, as described more fully in Section 140.6(c)2, and subject to the adjustments listed there, the allowed indoor lighting power allotment for general lighting shall be calculated for each area in the building as follows:

  i. For conditioned areas, by multiplying the conditioned square feet of the area times the applicable allotment of watts per square foot for the area shown in Table 140.6-C. ii. For unconditioned areas, by multiplying the unconditioned square feet of the area times the applicable allotment of watts per square foot for the area shown in Table 140.6-C. The allowed indoor lighting power allotment for general lighting for one area for which the area category method was used may be increased up to the amount that the allowed indoor lighting power allotment for general lighting for another area using the area category method is decreased, except that such increases and decreases shall not be made between conditioned and unconditioned space.

  2025 CALIFORNIA ENERGY CODE 133

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  NONRESIDENTIAL AND HOTEL/MOTEL OCCUPANCIES—PERFORMANCE AND PRESCRIPTIVE

  COMPLIANCE APPROACHES FOR ACHIEVING ENERGY EFFICIENCY

  TABLE 140.6-C—AREA CATEGORY METHOD—LIGHTING POWER DENSITY VALUES (WATTS/FT2)	Col2	Col3	Col4	Col5
  BUILDING TYPE/USE	PRIMARY FUNCTION AREA	ALLOWED LIGHTING POWER DENSITY FOR GENERAL LIGHTING (W/ft2)	ADDITIONAL LIGHTING POWER1	ADDITIONAL LIGHTING POWER1
  BUILDING TYPE/USE	PRIMARY FUNCTION AREA	ALLOWED LIGHTING POWER DENSITY FOR GENERAL LIGHTING (W/ft2)	Qualified Lighting Systems	Additional Allowance3 (W/ft², unless noted otherwise)
  Aging Eye/Low-Vision11	Corridor Area	0.

• § 170.2 High relevance — show source text

  The total allowed indoor lighting power for the building is the sum of all allowed indoor lighting power for all areas in the building. v. In addition to the allowed indoor lighting power calculated according to Sections 170.2(e)4Ai through iv, the building may add additional lighting power allowances for qualifying lighting systems as specified in the Qualifying Lighting Systems column in Table 170.2-M under the following conditions: a. Only primary function areas having a lighting system as specified in the Qualifying Lighting Systems column in Table 170.2-M and in accordance with the corresponding footnote of the table shall qualify for the additional lighting power allowances; and

  2025 CALIFORNIA ENERGY CODE 261

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  MULTIFAMILY BUILDINGS—PERFORMANCE AND PRESCRIPTIVE COMPLIANCE APPROACHES

  b. The additional lighting power allowances shall be used only if the plans clearly identify all applicable task areas and the lighting equipment designed to illuminate these tasks; and c. Tasks that are performed less than 2 hours per day or poor quality tasks that can be improved are not eligible for the additional lighting power allowances; and d. The additional lighting power allowances shall not utilize any type of luminaires that are used for general lighting in the building; and e. Reserved; and

  f. The additional lighting power allowed is the smaller of: I. the lighting power density listed in the “Allowed Additional Lighting LPD” column in Table 170.2-M, times the square feet of the primary function, or II. the adjusted indoor lighting power of the applicable lighting; and g. Floor displays shall not qualify for wall display allowances. h. Qualifying wall lighting shall: I. Be mounted within 10 feet of the wall having the wall display. When track lighting is used for wall display, and where portions of that lighting track are more than 10 feet from the wall and other portions are within 10 feet of the wall, portions of track more than 10 feet from the wall shall not be used for the wall display allowance; and II. Be a lighting system type appropriate for wall lighting. Lighting systems appropriate for wall lighting are lighting track adjacent to the wall, wall-washer luminaires, luminaires behind a wall valance or wall cove or accent light. (Accent luminaires are adjustable or fixed luminaires providing directional display light.) i. Mounting height shall be the luminaire mounting height measured from the finished floor to the bottom of the luminaire. If luminaires are mounted at different mounting heights within the same space, the average mounting height of the luminaires qualified for the additional lighting power allowances in Table 170.2-M can be used to establish the mounting height of the qualified luminaires for calculations of the additional lighting power allowances of the qualified luminaires.

  TABLE 170.2-M—AREA CATEGORY METHOD—LIGHTING POWER DENSITY VALUES (WATTS/FT2)	Col2	Col3	Col4
  PRIMARY FUNCTION AREA	ALLOWED LIGHTING POWER DENSITY FOR GENERAL **LIGHTING (W/ft2) **	ADDITIONAL LIGHTING POWER QUALIFIED LIGHTING SYSTEMS	ADDITIONAL LIGHTING POWER ADDITIONAL ALLOWANCE (W/ft2, unless noted otherwise)
  Storage	0.4	NA	NA
  Conference, Multipurpose and Meeting Area	0.75	Display	0.25
  Conference, Multipurpose and Meeting Area	0.

• § 0.4 High relevance — show source text

  D. Where areas are bounded or separated by interior partitions, the floor area occupied by those interior partitions may be included in primary function area. E. If at the time of permitting for a newly constructed building, a tenant is not identified for a multitenant area, a maximum of 0.4 watts per square foot shall be allowed for the lighting in each area in which a tenant has not been identified. The area shall be classified as unleased tenant area.

  F. Under the area category method, the allowed indoor lighting power for each primary function area is the lighting power density value in Table 140.6-C times the square feet of the primary function area. The total allowed indoor lighting power density for the building is the sum of all allowed indoor lighting powers densities for all areas in the building. G. In addition to the allowed indoor lighting power calculated according to Sections 140.6(c)2A through F, the building may add additional lighting power allowances for qualifying lighting systems as specified in the Qualifying Lighting Systems column in Table 140.6-C under the following conditions: i. Only primary function areas having a lighting system as specified in the Qualifying Lighting Systems column in Table 140.6-C and in accordance with the corresponding footnote of the table shall qualify for the additional lighting power allowances; and ii. The additional lighting power allowances shall be used only if the plans clearly identify all applicable task areas and the lighting equipment designed to illuminate these tasks; and iii. Tasks that are performed less than two hours per day or poor quality tasks that can be improved are not eligible for the additional lighting power allowances; and iv. The additional lighting power allowances shall not utilize any type of luminaires that are used for general lighting in the building; and v. The additional lighting power allowances shall not be used when using the complete building method; and vi. The additional lighting power allowed is the smaller of: a. the lighting power density listed in the “Allowed Additional Lighting LPD” column in Table 140.6-C, times the square feet of the primary function, or b. the adjusted indoor lighting power of the applicable lighting; and

  2025 CALIFORNIA ENERGY CODE 137

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  NONRESIDENTIAL AND HOTEL/MOTEL OCCUPANCIES—PERFORMANCE AND PRESCRIPTIVE

  COMPLIANCE APPROACHES FOR ACHIEVING ENERGY EFFICIENCY

  vii. In addition to meeting Sections 140.6(c)2Gi through vi, additional lighting power for videoconferencing as specified in Table 140.6-C shall be allowed in a videoconferencing studio, as defined in Section 100.1, provided the following conditions are met: a. A completed and signed installation certificate is prepared and submitted in accordance with Section 130.4(b), specifically detailing compliance with the applicable requirements of Section 140.6(c)2Gvii; and b. The videoconferencing studio is a room with permanently installed videoconferencing cameras, audio equipment, and playback equipment for both audio-based and video-based two-way communication between local and remote sites; and c. General lighting is switched in accordance with the requirements of Section 130.1(b); and d. Wall wash lighting is separately switched from the general lighting system; and e. All of the lighting in the studio, including general lighting and additional lighting power allowed by Section 140.6(c)2Gvii is controlled by a multiscene programmable control system (also known as a scene preset control system). viii.

• § 140.5 High relevance — show source text

  (c) High-capacity service water-heating systems . Gas service water-heating systems with a total installed gas water-heating input capacity of 1 MMBtu/h or greater shall have gas service water-heating equipment with a minimum thermal efficiency of 90 percent. Multiple units can meet this requirement if the water-heating input provided by equipment with thermal efficiencies above and below 90 percent averages out to an input capacity-weighted average of at least 90 percent.

  Exception 1 to Section 140.5(c): If 25 percent of the annual service water-heating requirement is provided by site-solar energy or site-recovered energy.

  Exception 2 to Section 140.5(c): Water heaters installed in individual dwelling units.

  Exception 3 to Section 140.5(c): Individual gas water heaters with input capacity at or below 100,000 Btu/h shall not be included in the calculations of the total system input or total system efficiency.

  Note: Authority: Sections 25213, 25218, 25218.5, 25402 and 25402.1, Public Resources Code. Reference: Sections 25007, 25008, 25218.5, 25310, 25402, 25402.1, 25402.4, 25402.8, and 25943, Public Resources Code.

  2025 CALIFORNIA ENERGY CODE 129

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  NONRESIDENTIAL AND HOTEL/MOTEL OCCUPANCIES—PERFORMANCE AND PRESCRIPTIVE

  COMPLIANCE APPROACHES FOR ACHIEVING ENERGY EFFICIENCY

  SECTION 140.6—PRESCRIPTIVE REQUIREMENTS FOR INDOOR LIGHTING

  A building complies with this section if: i. The calculation of adjusted indoor lighting power of all proposed building areas combined, calculated under Subsection (a) is no greater than the calculation of allowed indoor lighting power, specific methodologies calculated under Subsection (c); and

  ii. The calculation of allowed indoor lighting power, general rules comply with Subsection (b).

  The prescriptive limits on indoor lighting power are the smaller of the adjusted and allowed indoor lighting power values determined in accordance with Item i.

  (a) Calculation of adjusted indoor lighting power. The adjusted indoor lighting power of all proposed building areas is the total watts of all planned permanent and portable lighting systems in all areas of the proposed building; subject to the applicable adjustments under Subdivisions 1 through 4 of this subsection and the requirements of Subdivision 4 of this subsection.

  1. Two interlocked lighting systems. No more than two lighting systems may be used for an area, and if there are two they must be interlocked. Where there are two interlocked lighting systems, the watts of the lower wattage system may be excluded from the adjusted indoor lighting power density if: A. An installation certificate detailing compliance with Section 140.6(a)1 is submitted in accordance with Sections 10103 and 130.4; and B. The area or areas served by the interlocking systems is an auditorium, a convention center, a conference room, a multipurpose room or a theater; and C. The two lighting systems are interlocked with a nonprogrammable double-throw switch to prevent simultaneous operation of both systems. For compliance with Part 6 a nonprogrammable double-throw switch is an electrical switch commonly called a “single pole double throw” or “three-way” switch that is wired as a selector switch allowing one of two loads to be enabled.
• § 140.6 High relevance — show source text

  Reserved.
  5. Illuminated mirrors: lighting shall be dedicated to the mirror.
  6. Portable lighting in office areas includes under-shelf or furniture-mounted supplemental task lighting when controlled by a time clock or an occupancy sensor.
  7. Detailed task work: lighting provides the high level of visual acuity needed for activities that require close attention to small elements and/or extreme close-up work.
  8. Specialized task work: lighting provides for small-scale, cognitive or fast-performance visual tasks; lighting required for operating specialized equipment associated with
  pharmaceutical/laboratorial activities.
  9. Precision specialized work: lighting for work performed within a commercial or industrial environment that entails working with low-contrast, finely detailed or fast-moving
  objects.
  10. Tunable white luminaires capable of color change greater than or equal to 2000K CCT, or dim-to-warm luminaires capable of color change greater than or equal to 500K CCT,
  connected to controls that allow color changing of the luminaires.
  11. Aging eye/low-vision areas can be documented as being designed to comply with the light levels in ANSI/IES RP-28 and are or will be licensed by local or state authorities for
  senior long-term care, adult day care, senior support and/or people with special visual needs.
  12. Transition lighting OFF at night. Lighting power controlled by astronomical time clock or other control to shut off lighting at night. Additional LPD only applies to area within
  30 feet of an exit. Not applicable to lighting in daylit zones.
  13. Class I facility is used for competition play for 5000 or more spectators. Class II facility is used for competition play for up to 5000 spectators. Class III facility is used for compe-
  tition play for up to 2000 spectators. Class IV facility is normally used for recreational play and there is limited or no provision for spectators.
  14. The additional videoconferencing lighting power shall be allowed provided the videoconferencing studio meets all the requirements of Section 140.6(c)2Gvii.|

  136 2025 CALIFORNIA ENERGY CODE

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  NONRESIDENTIAL AND HOTEL/MOTEL OCCUPANCIES—PERFORMANCE AND PRESCRIPTIVE

  COMPLIANCE APPROACHES FOR ACHIEVING ENERGY EFFICIENCY

  4. Allowed indoor lighting power allotments for all lighting power allotments other than general lighting shall be restricted as follows:

  When using the area category method, allowed indoor lighting power allotments for specialized task work, precision commercial and industrial work, white board or chalk board, accent, display, decorative, videoconferencing studio, wall display, floor display, task, or very valuable display case, may not be increased as a result of, or otherwise traded off against, decreasing any other allotment.

  (c) Calculation of allowed indoor lighting power: specific methodologies. The allowed indoor lighting power for each building type, or each primary function area shall be calculated using only one of the methods in Subsection 1 or 2 below as applicable.

  1. Complete building method. Requirements for using the complete building method include all of the following: A. The complete building method shall be used only for building types, as defined in Section 100.1, that are specifically listed in Table 140.6-B. (For example, retail and wholesale stores, hotel/motel, and high-rise residential buildings shall not use this method.)
• § 140.6 High relevance — show source text

  The additional lighting power allowed is the smaller of: a. the lighting power density listed in the “Allowed Additional Lighting LPD” column in Table 140.6-C, times the square feet of the primary function, or b. the adjusted indoor lighting power of the applicable lighting; and

  2025 CALIFORNIA ENERGY CODE 137

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  NONRESIDENTIAL AND HOTEL/MOTEL OCCUPANCIES—PERFORMANCE AND PRESCRIPTIVE

  COMPLIANCE APPROACHES FOR ACHIEVING ENERGY EFFICIENCY

  vii. In addition to meeting Sections 140.6(c)2Gi through vi, additional lighting power for videoconferencing as specified in Table 140.6-C shall be allowed in a videoconferencing studio, as defined in Section 100.1, provided the following conditions are met: a. A completed and signed installation certificate is prepared and submitted in accordance with Section 130.4(b), specifically detailing compliance with the applicable requirements of Section 140.6(c)2Gvii; and b. The videoconferencing studio is a room with permanently installed videoconferencing cameras, audio equipment, and playback equipment for both audio-based and video-based two-way communication between local and remote sites; and c. General lighting is switched in accordance with the requirements of Section 130.1(b); and d. Wall wash lighting is separately switched from the general lighting system; and e. All of the lighting in the studio, including general lighting and additional lighting power allowed by Section 140.6(c)2Gvii is controlled by a multiscene programmable control system (also known as a scene preset control system). viii. Floor displays shall not qualify for wall display allowances. ix. Qualifying wall lighting shall: a. Be mounted within 10 feet of the wall having the wall display. When track lighting is used for wall display, and where portions of that lighting track are more than 10 feet from the wall and other portions are within 10 feet of the wall, portions of track more than 10 feet from the wall shall not be used for the wall display allowance; and b. Be a lighting system type appropriate for wall lighting. Lighting systems appropriate for wall lighting are lighting track adjacent to the wall, wall-washer luminaires, luminaires behind a wall valance or wall cove, or accent light. (Accent luminaires are adjustable or fixed luminaires providing directional display light.) x. Additional allowed power for wall display lighting is available only for lighting that illuminates walls having wall displays. The length of display walls shall include the length of the perimeter walls, including but not limited to closable openings and permanent full-height interior partitions. Permanent full-height interior partitions are those that (I) extend from the floor to within 2 feet of the ceiling or are taller than 10 feet and (II) are permanently anchored to the floor. xi. Mounting height shall be the luminaire mounting height measured from the finished floor to the bottom of the luminaire. If luminaires are mounted at different mounting heights within the same space, the average mounting height of the luminaires qualified for the additional lighting power allowances in Table 140.6-C can be used to establish the mounting height of the qualified luminaires for calculations of the additional lighting power allowances of the qualified luminaires.