I have mixed feeling about this, the credibility of these bulbs.I use a powersun 160w,also a hundred watt basking bulb.(not sure what brand, at work now).Anyway, I purchased a UV-Hawk, which is a small meter, take it outside in the sun, push the button, and you get the UV index or strength of the sun on you.Now, take it in the house, hold it under your power sun,even close and I get a 2,under the basking bulb,which is supposed to be for heat, and I get a 7.Outside i get a 6 or 7 here in michigan.I have a name brand floresent,its a good one.Bulbs are like 2 months old.Hold the UV-hawk under it close, you get 0.Go figure.The best thing, I have built a small box,I sit it outside, it has 3/8s mesh, and a place for shade.I take both the HL's outside , and they get some real sunshine.I don't believe In any bulbs anymore.Is this meter accurate?,Not really sure, but it makes you wonder why in the sun it's a 6,and the bulbs in our enclosure is almost nil.scott

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