ZooMed Daylight Blue Bulbs are full spectrum daylight bulbs for heating reptile or amphibian terrariums. They are made of true blue glass (not painted or coated) for better heat transfer. They provide the UVA rays which stimulate reptiles' normal feeding behavior and may be used to heat most types of reptile and amphibian aquariums. European quality for long burn life - Guaranteed 1000 hrs up to 3000 hrs life.