This stops the more sensitive birds from being shocked by lights suddenly going on or off. Quartz and infrared lamps are valuable heating devices. These bulbs concentrate heat in a small area. The quality of the air is an often over looked, but easily controlled, factor. Most basement bird rooms are too damp.
Excess moisture allows molds and bacteria to prosper and to attack our birds.
Seed and pellets lose quality very quickly stored under such conditions. An automatic dehumidifier will remove all problem water from the air. The reverse situation should also be of concern. If the air does not contain enough moisture the young will have trouble escaping from the egg, perhaps dying in the process. Here, the fancier would install a humidifier in the birdroom.