Fluker Labs Reptile Incandescent Daylight Bulb for Pet Habitat Incandescent daylight bulb for basking animals Provide the radiant heat (infrared light) that reptiles need Reptiles are exothermic and depend on their environmental temperature to regulate their core body temperature If a reptile is not provided an appropriate environmental temperature range (ETR), it may be predisposed to chronic infections Available in 40-watt bulb and blue color