Carolina Custom Cages 50w GU10 Halogen Reptile Basking Bulb This 50w GU10 Halogen Reptile Basking Bulb works 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, LLC. The heat output is typically adequate with a 20L size habitat when mounted under the cage tops screen mesh. 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.