We started with red lights because that's what we were told to get. We now only use them in emergencies, when we have no black or white bulbs. After a week of continuous white light (red will do as well) we put the chicks onto a day and night regime, just as they would have with a mother hen in Maytime. An 80W ceramic (or dull emitter or black light) at night increasing from 6 -10 hours over a week and a 180W high efficiency white light set much higher for daytime. They grow stronger under that system we think; 46 hatched and no losses. They cram their little crops full expecting night at any time until they settle into it. Probably reduces overcrowding issues as well.
The set height of the lights increases gradually to reduce their temperature as normal, until they go outside at 6 weeks. They are then on natural day and night, a system which they are used to.
Red lights are for commercial applications where feather pecking due to overcramped conditions is commonplace and the red light supposedly hides the blood to stop the pecked individuals being devoured!