Multi-level Lighting Controls
These devices reduce lighting power by either continuous dimming, stepped dimming, or stepped switching while maintaining a reasonably uniform level of illuminance throughout the controlled space.
Multi-level lighting controls will be used for any enclosed space 100 ft2
or larger that has a connected lighting load greater than 0.8 W/ft2
, and that has more than one luminaire. The multi-level lighting controls must have one control step that is between 50% and 70% of design lighting power and at least one step of minimum output operating at less than 35% of full rated lighting system power (this could be completely off).