UVB is always a hard ongoing discussion in the herp world.
A friend of mine owns a UV tester. They're expensive so she tests the lights for me.
The best ever light for UVB output is:
http://www.reptiledirect.com/product.asp?3=39
This is the cheapest place to buy also.
Beleive me I have at least 50 lights here that say right on the box "full spectrum lighting" and it doesn't have what our herps need!
Maybe we can have a UVB discussion in a general herp forum as I think it would benifit everyone who needs special lighting.
But thats just my 2 cents
Thanks
RUSTY