I just found this website:

http://www.uvguide.co.uk/mercvapourfloods.htm#zoomedpowersun

http://www.uvguide.co.uk/mercvapournarrowfloods.htm#reptileuvmegarays

That particular page has information about the Powersun's. But is data for all the major UVB sources on the market, including the Mega Ray Mercury Vapor lights.

Mega Ray lamps are far superior to the Powersun's, the effective UVB distance is nearly doubled, and the decay is less than 30% (or even less than 10%) over its lifetime. Powersun's decay 50% in their first week of use. I think I am going to replace my powersun with a Mega Ray.

Some of the more powerful fluorescent tubes compare to the some of the Mercury Vapor bulbs.
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