i doubt it would physicaly hurt a BP, but if they can see in that light specturm it would probbly stress them out just like a normal bulb..... a good night time bulb is a red IR heat bulb, cuz BPs cant see into the red light specturm - atleast thats what ive been told, and i hope its true cuz ive had one on day n night on my BP since i got her 5 months ago lol