It's not against the rules to put in a little night light. I've employed these from time to time, especially when clumsy Brahma roos have trouble getting onto the perch.
I've also put in a low wattage, red "party light" to supply the comfort of a red heat lamp without the added heat, and it aids in seeing without stimulating them to stay awake all night. But your guys have had enough time to get used to not needing the red heat lamp for comfort, so you really don't need it.
I've also put in a low wattage, red "party light" to supply the comfort of a red heat lamp without the added heat, and it aids in seeing without stimulating them to stay awake all night. But your guys have had enough time to get used to not needing the red heat lamp for comfort, so you really don't need it.