Zoo Med's Naturalistic Terrarium Hood is designed to fit all 18 inch wide Naturalistic Terrariums (NT-3 & NT-4), or can be used with any other terrarium that size permits. This hood can hold one ReptiSun Compact Fluorescent UVB lamp and one incandescent heat lamp up to 60 watts. A built-in reflector allows for increased heat/UVB penetration in your terrarium. Two separate On/Off switches allow for independent lamp operation. This makes it possible to turn the UVB lamp off at night without turning off your nighttime heat source. Dimensions: 18"L x 5"W x 3.25"H. Shipping weight: 3 lbs.