Barbara, were ALL of your Solar Glos purchased at the same time then? If you want to part with a few, I will be glad to test a few for you, just to see if they are bad which they probably are.
I am pretty sure I mentioned this somewhere, but my lucky friend up in Canada had purchased a Solar Glo just a few months ago. I talked her into buying a UVB meter, a 6.2, & she tested it recently. Darn it! The darn bulb actually was putting out 104uW/cm2~! Now why couldn't I have gotten a couple that at least put that out??
Anyway, as I have reported according to what Frances has been saying is that for some reason, Exoterra/Hagen is not putting out consistent lights which is making it increasingly difficult to come up with a "standard measurement" for UVB reporting for them. This is unfortunate because I cannot recommend them until they get their standardization up to par, the lights are just too off the boards. They will put out one light with certain specs, then, another one of the same model will come out with completely different specs. This is very inconsistent & I don't feel right recommending them until I know they are putting out the same exact specs/readings for each & every bulb, within reason.
I realize this is so frustrating, but, hang in there. I think that things will get better, eventually.