While I don't currently keep BPs, some of my other snakes enjoy heat lamps overhead, dimmed down so they can bask comfortably at night, & I see no difference, much
less any negative effects, from using either a red or black bulb this way. Just remember that my 'lights' are dimmed, not the only heat source, & my snakes don't need
as much heat as a BP does...& remember that heat rises (so this is an inefficient way of heating) & if you're running these lights near full-power to give more warmth to
a BP, that amount of light might very well be a stressor to your snake...not so much because it's red, but for how many watts you're running.
The reason I don't use CHE's is that I've heard they tend to burn out fairly fast (& they cost a lot more than incandescent bulbs), especially when they are dimmed. Hopefully, if yours are connected to the right kind of thermostat, they'll be OK.
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