ZillaŽ Incandescent Bulbs feature heavy-duty filaments that yield more hours of service from every bulb than the average filaments. Choose from a full selection to meet specific pet care needs. Provides ambient heat that creates a healthy environment for reptiles Heavy-duty filaments yield hours of performance Recommended for use with ZillaŽ Reflector Domes Does not emit visual light which can be disruptive to the creature or room