The 18″ Naturalistic Terrarium Hood includes a built-in reflector and two sockets for heat and UVB lamps. Additional Information: This hood fits all 18″ wide Naturalistic Terrariums (Zoo Med items# NT-3 or NT-4) UVB: Use with Zoo Med’s Reptisun? 5.0 UVB Compact Fluorescent Lamp for UVB and UVA Heat: Use Zoo Med’s Daylight Blue Reptile Bulb for daytime heat (up to 60 watts) or Zoo Med’s Nightlight Red Reptile Bulb for 24 hour heat (up to 60 watts)