Carolina Custom Cages 75w GU10 Halogen Reptile Basking Bulbs, set of 2 These 75w GU10 Halogen Reptile Basking Bulbs work well with the T5HO Fixture & Reflector with Basking Light Assembly, the Reptile GU10 Halogen Dome Fixture with 54" AC cord and switch or the Reptile GU10 Halogen Basking Light Assembly with 54" AC cord also by Carolina Custom Cages. Carolina Custom Cages is a division of Carolina Designer Dragons, Inc. The heat output is typically adequate with an adult size habitat, such as the Carolina Custom Cages' Terrarium Models 36Lx18Wx18H, 36Lx24Wx18H, 48Lx18Wx18H and 48Lx24Wx18H; when mounted under the terrariums screen mesh top. We like the directional output of the halogen bulb, as well as its greater energy efficiency. This helps your power bill not only by using less wattage, but also by making less of an impact on your air conditioning.