T he Mega-Ray mercury vapor bulb is Self Ballasted Par-38 Narrow Flood Lamp in 120 volt which has been shown in tests to produce similar amounts of UVB to natural sunlight! Along with adequate heat, the bulb creates a basking spot at the recommended distances in most circumstances (additional lighting and heating should be considered if necessary). It promotes the synthesis of Vitamin D3 and prevents metabolic bone disease, and because of the very high levels of UVA, stimulates the emotional well being and activity.
This Mega-Ray original design, the only bulb to use a translucent magnesium oxide inner coating in the world, provides the necessary visible light, UVB, UVA and heat for UVB-dependent basking reptiles.
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 50-75 microwatts per square centimeter (uW/cm2) of UVB.