The Exo Terra Compact Canopy is a compact fluorescent terrarium canopy designed for use with the Exo Terra Glass Terrarium. This easy-to-install canopy accommodates four compact fluorescent bulbs or low wattage incandescent bulbs. 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. The Exo Terra Compact Canopy is an important aspect of the lighting and heating system, ensuring the safety and proper function of the applied light or heat source. The Exo Terra Compact Canopy Features and Benefits:. - Fits one or more Exo Terra compact fluorescent (maximum 26 W) or incandescent bulb (maximum 40 W). - Built-in reflector. - Easy to install. - Sliding rim to mount accessories such as the Exo Terra Combo Digital Thermo-Hygrometer. 36"" length x 7.8"" width x 3.5"" height