The Exo Terra Solar Glo Sun Simulating Lamp is the solution to one of the most important aspects of keeping reptiles & amphibians, providing the benefits of natural sunlight. The proper balance of ultraviolet light (including UVA & UVB), visual light & infrared light (heat) in one easy-to-install bulb makes the Exo Terra Solar Glo the choice of professional breeders. The Solar Glo is a full spectrum light with carefully tuned peaks to ensure appetite, activity, brilliant colours, & calcium absorption through Vitamin D3 production, & above all to prevent metabolic bone disease. The Exo Terra Solar Glo is available in two wattages, 125 W & 160 W. Exo Terra refrained from developing lower wattages as lower wattages simply do not generate enough heat for these self-ballasted bulbs to work properly, making them unstable & unreliable.