Zoo Meds new 18 (46cm) size PALUDARIUM HOOD is designed to fit all 18 inch wide PALUDARIUMS or NATURALISTIC TERRARIUMS. This hood can hold one PALUDARIUM 3-in-1 lamp and one incandescent heat lamp up to 60 watts (e.g. Zoo Meds Daylight Blue or Nightlight Red Reptile Bulbs). A built-in reflector allows for increased heat and 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.