I do have a lux meter and use it regularly. This afternoon I’m going to see if I can achieve the light I need and reduce power consumption by getting lights real close
I have a 4x3 flowering footprint that I light with 4 hlg 288rspec at 240 watts per pair. I usually run them 18 inches or so above the canopy. I’m trying to reduce the heat load while still maintaining sufficient light. I have plenty of extra boards. I’m thinking about spreading the wattage...