I'm not sure if they can "see" it or not, but they can certainly perceive it with their heat-sensing pits anyway. I have used red or "black" incandescent bulbs (dimmed down substantially) to allow for some nocturnal warmth in winter for various snakes I keep- my Aussie spotted python often chooses to bask under it (instead of using her UTH-warmed hide), & my Trans Pecos rat snakes also snuggle under their "night-lights", frequently sleeping in baskets wired into their branches, so honestly I don't see what the concern is. I doubt that it would bother your BP one little bit.
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