I dont own a red light.
I brood with a heat lamp, but use household bulbs. I start usually with a 75, then I reduce to 60, 45, then adjust when they go out
Once they are fully feathered its gets discontinued.
Even a dim light will be a comfort for them for while they transition to the new...
Mine all go out at 2 weeks. No matter what time of year.
Dust, noise and smell are the reasons they must get out!
With a heat lamp of course.
I will use light bulbs down to a 15 watt sometimes before I discontinue the light altogether.
This gives them a gradual transition to natural darkness...