I have black recessed cans in my ceiling in several rooms. The house was built in early 1990's. Because of the color, they are not "producing" enough light.
My handyman told me that I might be able to replace just the cans themselves, w/o replacing the whole units (for which the electricinan is charging $100/piece).
Sorry if I am not explaining this correctly.
If the cans cannot be replaced, can they be painted white? Is there a paint that can withstand that kind of heat?