The Exo Terra Repti-Glo 5.0 Tropical Terrarium Lamp has a moderate to high UVB output similar to that of shady environments such as rain forests and other tropical locations. Reptiles living in these habitats receive less UV radiation because of the many climatological conditions that prevent direct sunlight from reaching them or their basking sites. The Exo Terra Repti-Glo 5.0 Tropical Terrarium Lamp helps to provide necessary UVB rays for optimal calcium metabolism. The linear Repti Glo bulbs have a higher output and divide the energy more efficiently over wider terrariums. The bulbs have a wattage of 25 and the longer sizes can even be placed on multiple terrariums. The Exo Terra Repti-Glo 5.0 Tropical Terrarium Lamp Features and Benefits:. - Ideal for all tropical and sub-tropical reptiles. - High UVB output. Effective up to 12 . - Provides necessary UVB rays for optimal calcium metabolism. - Stimulates appetite activity and reproductive behavior through UVA radiation. - Recommended in combination with Repti Glo 2.0 for a higher visual light output. 30 length