This will give quantitative guidance on how to set up your basking globe and UV source wrt
levels of UV , and temperatures , and appropriate UV and temperature gradients.
viewtopic.php?f=34&t=249112
Please be aware that mounting any UV source ontop a mesh lid , unless it's very big mesh ( like bird cage mesh ) will result in a significant "shading loss" of UV up to 45% which will more or less cancel the benefits of having a properly designed reflector or reflector hood.
Only practical way to get zero UVI is by providng a hide.