umol/joule

I have 4 mars hydro ii 900w panels 100 LEDS replaced only blue spectrum as i think these burn the hottest (460nm + 440nm) All other LEDs seem in good order apart from a couple which i will also replace. My grow space can either be 6.5ft x 6.5ft( 2mx2m ) or 8ft x 8ft (2.4mx2.4m ) I haven't quite...

There are a lot of members here who seem to distrust when I say that umol/joule is not a good indicator of how well a light can grow plants. Various members here have demanded I have my lights tested for these figures and recommended me to a company called CSA Group to do so. I have contacted...