The Zoo Med Moonlite Reptile Bulb is a nighttime light and heat source designed for nocturnal reptiles and amphibians. Perfect for use in horizontal-facing light hoods, this long-lasting bulb is made from true blue glass—not painted or coated—to provide superior heat transfer. It casts a gentle "moonlight" that won't disrupt sleeping schedules and also provides beneficial UVA rays to promote the health and general well-being of reptiles and amphibians. Plus, it can be paired with a thermostat or rheostat (sold separately) for increased output control.