The Exo Terra Repti Glo 5.0 Compact 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 (fairly high humidity,changes in weather, etc) that prevent direct sunlight from reaching them or their basking sites. Fluorescent bulbs lose theirUV radiation and approximately 50% of their lighting output quality within one year. Ideal for all tropical and sub-tropical reptiles, the Exo Terra Repti Glo 5.0 Compact Tropical Terrarium Lamp provides the necessary UVB ray for optimal calcium metabolism and stimulates appetite, activity and reproductive behaviour through UVA radiation. Recommended in combination with Repti Glo 2.0 Compact Full Spectrum Terrarium Lamp for a higher visual light output.