Its not that simple. Your post doest explain my success.the silver lamp is over window screen that is covering a 2" gap in the glass that runs the width of the tank. so, yes some will be blocked by the glass, but most is not. The bulb is a zoo med 13W 10.0 UVB.
UVB is what causes skin burns, why couldnt is cause damage to an amphibian with very thin skin? a quick google search confirmed that UVB can kill amphibians.
edit: I am not saying UVB is bad, just that I was using the wrong bulb for amphibians.
Ultraviolet light is Everywhere - in every biome - since the solar senric beginning of time.
I am not going to argue it. But as a professional in this field, 35+ years, with a boss that worked the Reptile collection in the Bronx and Brooklyn zoo, you are wrong. So wrong.