(Source: NREL PIX)
*Estimated using engineering interpretation of the IES Handbook (Rea et. al. 1993) **Pictures and COU values in Table 20 provided by Lithonia (http://www.lightathome.com) unless otherwise noted.
Once the fixture type and room characteristics are defined, the efficacy (lumen per watt) is used to determine if the footcandle requirement is met in a particular room. These values will be different depending on the type of lamp that is used in a given fixture. Using multiple references, default values for common lamp types were developed for both the Benchmark and Prototype lamps (Table 21). These defaults may be modified for the Prototype with sufficient justification.
For Either Option:
The lighting plans for the Prototype and Benchmark shall use the hours of operation listed in Table 22, unless the Prototype includes specific design measures that alter the operating time of the lighting system, such as occupancy sensors, dimming switches, or a building automation system.
For common areas in multi-family buildings, the lighting operating hours are 24 h/day, every day of the year for the central laundry room, indoor corridors, and elevators. Outdoor lighting should be scheduled to operate from dusk to dawn. Specific hours will depend on location and time of