C405.2.2.2 Light-Reduction Controls
Spaces required to have light-reduction controls shall have a manual control that allows the occupant to reduce the connected lighting load in a reasonably uniform illumination pattern by not less than 50 percent. Lighting reduction shall be achieved by one of the following or another approved method:
- Controlling all lamps or luminaires.
- Dual switching of alternate rows of luminaires, alternate luminaires or alternate lamps.
- Switching the middle lamp luminaires independently of the outer lamps.