Theoretically, they can't see a red light,but I'm not entirely convinced that's true. I used one on my Green tree python for a short while when my other heating unit took a dive and she seemed to be very able to see it. She was less active and noticed movement within the room easily. I didn't notice anything like that with the corns, but they are not as active at night as the pythons, who are completely nocturnal and have a different pupil. I do know that the heat lamp really dries the air, and you might end up with bad sheds. I would stick to the under tank heater for warming and use a black light (black party bulb, not u.v. light) for night viewing.