Bulb question

[Bogertophis]

I'll jump in & tell you that I use red OR black incandescent bulbs to add a little overhead warmth for some of my snakes...they do not seem bothered by
either one & they definitely don't like bright lights, so red or black bulbs are much better than regular white incandescent bulbs (& for most of our snakes).
I do agree with Coluber42's explanation...CHEs are a good option too, depending on what you're keeping & how much warmth you need them for.