Mega-Ray Mercury Vapor Bulb - 100 Watts (120V)

Self-ballasted mercury vapor bulb. For 10 years, it has been shown to have the longest lasting UVB production of any other mercury vapor bulbs available. Promotes the synthesis of Vitamin D3 and prevents metabolic bone disease. Produces similar amounts of UVB to natural sunlight. 100 Watt Bulb - MINIMUM distance setting of 12" will produce approximately 150-200 microwatts per square centimeter(uW/cm2) of UVB and 900-1200uW/cm2 of UVA. MAXIMUM distance setting of 20" will produce 50-70 microwatts per square centimeter (uW/cm2) of UVB. (Distnace us measured from lamp face to basking spot or reptile for optimum UVB and heat.)