Reptile lamps contain the highest amounts of both UVB and UVA wavelengths Allows reptiles the ability to regulate their own Vitamin D3 level as they would in nature Eliminates the risk of Vitamin D3 overdose (highly toxic) from synthetic sources Provide the exact band of rays within the UVB spectrum for maximum Vitamin D3 synthesis and calcium absorption. ReptiSun 5.0 UVB Bulbs supply an amazing 5.0 percent UVB and up to 30 percent UVA; outputs active UVB up to 12" from the bulb's surface. The bulb's UVA/UVB wavelength remains effective for 1 to 1-1/2 years. Use with lizards (other than iguanas) to help prevent bone problems, as well as turtles and tortoises to improve shell growth. Increases appetite, activity and breeding and is beneficial to the psychological well-being of captive reptiles and amphibians.Bulbs are compatible with the following fixtures: Fluorescent Strip Lights "The Slider" Reptile Hood

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