John I'm using the 6.2 solarmeter, the reason I ask is I have just bought a 100w and 160w to experiment with them, to see how the temps and UVB are.
To maintain a basking temp of 33c the 100w has to be hanging 7 inches from the top of there shell the UVB is 254
The 160w is 15 inches from the top of there shell to maintain 33c the UVB is 117.
I intend to take the reading every other day to see what the UVB does.
I don't rate combi bulbs as I think the UVB drops very quickly even after a few weeks.
My T5s are still giving out over 125uvb at 12 inches above there shell and they are between 18-24 months old. I have just replaced these tubes and they are all over 200uvb now.
Thanks
Andy
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