Was this the chart?
https://sites.google.com/site/thelizardmadness/lighting-guides
My info is a summary of Fran Baines work, she also gives the UV irradiance for her measures and you can find her charts by joining up here
https://groups.yahoo.com/neo/groups/UVB_Meter_Owners/ or here
https://www.facebook.com/groups/384134861721116/
Yes, that's the chart, and I originally found it while reading through your threads here and at UVB. The T5 10.0 UVI figures were what I used to come up with the ideal basking spot @ 4.7 screened and reflected. Based on the UVB readings related to a UVI of 4.7 for the same bulb (as shown in the files section at UVB), it should be around 160 reflected with no screen, or somewhere around 90 with a screen. So, I have to think that either the wattage and/or size of the bulb is a factor, or I have a defective meter.
If I recall correctly longer bulbs are stronger than shorter ones, but I would have to verify that. Additionally where you measure along the length and angle around the bulb is important too. They are strongest right in the middle and your sensor needs to point directly at the tube.
I would like to see that stated somewhere if you can find it. I think it must be the case since the 5.0 and 10.0 are percentages of total light output, which would vary by wattage.
I found the Eco-terra screen I have reduced by about 45% and since it's a physical blocking of the light a tighter mesh will block more than an open mesh.
That is about what I get too.
I just took a reading of a new 160 watt Solar Glo and it was about 130 at 12 inches. The chart on the box states it should be 260 at 12 inches. Thanks for your help. Not sure what to make of it all. My friend went lethargic on me a couple of months after getting the T5 and I have been to the vet for all kinds of treatments. when I finally got my meter, I was a little surprised to see the low UVB output.