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Residential Lighting and Title 24
The Title 24 residential lighting requirements apply only to permanently installed luminaires (light fixtures), not portable lamps that are provided by the occupant. The installed wattage of permanently installed luminaires must be considered only in kitchens. For each room or area, the requirements may be summarized as follows:
Kitchen lighting includes all permanently installed lighting in the kitchen. Lighting in areas adjacent to the kitchen, such as dining and nook areas, are considered kitchen lighting if they are not separately switched from kitchen lighting. At least half the lighting watts installed in a kitchen must be consumed by high efficacy (see definition below) luminaires. For example, if 150 watts of high efficacy lighting is installed, no more than 150 watts of low efficacy (incandescent) lighting can be installed. There are no limits to the total number of watts that can be installed in a residential kitchen.
Detached Garages, Laundry Rooms, and Utility Rooms
All luminaires shall be high efficacy and shall be controlled by a vacancy sensor. Closets that are less than 70 square feet are exempt from this requirement.
At least one luminaire must be high efficacy and all other luminaires must be high efficacy or controlled by a vacancy sensor.
All Other Rooms
This applies only to rooms that are not kitchens, bathrooms, garages, laundry rooms or utility rooms. All installed luminaires shall either be high efficacy or shall be controlled by a vacancy sensor or dimmer. Exceptions to this requirement include closets <70 ft2 and lighting in detached storage buildings <1000 ft2 located on a residential site.
Residential Outdoor Lighting
All luminaires mounted to the building or to other buildings on the same lot shall be high efficacy luminaires, or may be low efficacy if the control requirements of section 150.0k(9A) are met.
High Efficacy Luminaire
According to the Title 24 energy standards a high efficacy luminaire contains only high efficacy lamps or high efficacy LED lighting, and must not contain a socket which allows any low efficacy lighting system to be used. For example, any luminaire containing a medium screw base socket is classified as low efficacy, regardless of the type of lamp installed into that socket. Typically, high efficacy luminaires contain pin-based sockets, like compact fluorescent or linear fluorescent lamp sockets, though other socket types such as screw sockets specifically rated only for high intensity discharge lamps (like metal halide lamps) light emitting diode (LED) luminaires (dedicated LED lighting fixtures that cannot use incandescent or any other type of lighting technology) may also qualify as high efficacy.