The Handbook of Facilities Planning (1990) describes special considerations for lighting fixtures in a laboratory that houses animals:
Animal rooms require a two-level lighting arrangement. Since most laboratory animals are nocturnal, a night cycle of 0–1 foot-candles and a day cycle generally of 30–50 foot-candles with a wide-spectrum fluorescent light source and a cleaning cycle with 70–100 foot-candles are required. Night levels should be as low as possible, with as few light leaks as possible from corridors or adjacent rooms.
The lighting control for the animal rooms has been a local time clock-controlled system. This, however, is being replaced with a more sophisticated, computer-controlled system. The reason for this is that a central control point for all rooms provides accurate logs for documentation purposes.