Naturalistic Terrarium® Hoods include a built-in reflector and socket(s) for heat or UVB lamps. The 12″ Naturalistic Terrarium® Hood includes a built-in reflector and socket for heat or UVB lamps. Fits all 12″ wide Naturalistic Terrariums® (Zoo Med items # NT-1 or NT-2). The 18″ Naturalistic Terrarium® Hood includes a built-in reflector and two sockets for heat and UVB lamps. Fits all 18″ wide Naturalistic Terrariums® (Zoo Med items# NT-3 or NT-4).