The Zilla Night Red Incandescent Heat bulb is ideal for tropical and desert habitats the Night Red Incandescent Heat Bulb provides ambient heat in which most of the photons emitted by the filament never escape the dark tint. Provides 24-hour ambient heat source for a healthy reptile habitat Red light provides nocturnal viewing without disturbing the reptiles day/night cycles Great for tropical and desert reptiles The Night Red Incandescent Heat Bulb heats the air inside the enclosure to create the warmth needed for a healthy reptile environment. The Night Red Incandescent Heat Bulb is made from glass containing rare earth red phosphors and emits red light which is less visible to reptiles. The Red Night Incandescent Heat Bulb is great for nocturnal viewing without disturbing the reptiles day/night cycle. The Night Red Incandescent Heat Bulb provides 24-hour ambient heat source for a healthy reptile environment.