This lamp is Mega-Ray’s top-of-the-range 100 watt SB Par-38 Narrow Flood Lamp which has been shown in tests to produce similar amounts of UVB to natural sunlight! – along with adequate heat to create a basking spot at the recommended distances, in many circumstances. Mega-Ray? SB 100-watt narrow-flood is a 100-watt SB Par-38 True Frosted Flood Lamp. A true flood lamp, it will disperse usable UVB in a 30″ circumference at a 20″ distance.

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. (Distance is measured from lamp face to basking spot or reptile for optimum UVB and heat.)
Most people with UVB meters are getting 18+ months use out of our SB bulbs.