The Zilla Heat & UVB Basking Fixture is a 2-in-1 fixture that concentrates both UVB and heat into one basking area. This is an energy efficient and compact alternative to mercury vapor bulbs. Ideal for desert and tropical reptile species that require UVB and a basking site. Designed for use only with coiled CFL style UVB bulbs and the Zilla Mini Halogen Bulbs. Bulbs are not included. Heat lamps should only be placed on enclosures with metal screen tops.