Hagen's Exo Terra Repti Glo 10.0 Desert Terrarium Lamp is a bulb associated with desert environments and thus with a very high UV-output. Desert locations receive more direct sunlight than any other because of fewer clouds, less air humidity and no plants or trees to provide shade. UVA (33%) stimulates appetite, activity and reproductive behavior. UVB (10%) promotes Vitamin D3 synthesis. Makes desert animals thrive. This bulb can also be used on screened terrariums or terrariums with dense screen covers to ensure UVB penetration. Dense screens can filter out up to 50% of the UVB rays. T8 bulb. Shipping weight: 1 1/2 lbs.