Fits the 30x30x30cm or 30x30x45cm Terrariums. Takes 1 compact fluorescent bulb. The Exo Terra Compact Top Canopy is a compact fluorescent terrarium canopy designed for use with the Exo Terra Glass Terrarium. This easy-to-install canopy accommodates compact fluorescent bulbs or low wattage incandescent bulbs. A combination of two different Exo Terra Repti Glo compact fluorescent bulbs can be used (PT-2226-2227) to create the ideal ultraviolet/visual light ratio or a combination with an incandescent light source such as the Exo Terra Sun Glo to increase the ambient air-temperature. Optional accessories such as the Exo Terra Digital Thermometer and Hygrometer and the Exo Terra Thermostat and Hygrostat can be slid into the special sliding rim on the top of the canopy.