If the issue is from too much light and not heat, then try a LUX meter app on your phone. It's inaccurate for LED, but the reading you get will always be lower than what the actually LUX is, or so I am told. It doesn't register the UV/IR, so you don't get an accurate reading, with the SF you have some light that isn't being measured. The idea is to find the right height to get proper/even coverage, then dial the intensity in to get the number you want. I have been shooting for 60-70k in flower and have had great results. If you have CO2 you can push up to 90-100k, but without CO2 your just running your light bill up, the temp, and possibly giving them too much light.