also remember, these are lights designed for the commercial market and adapted to home/DIY. I see a lot of people using Quantum boards at home with satisfying results. Amit and the guys know what they are doing when they design these boards. All my data is either supplied by HLG or from the lights I personally use. So I try to answer questions to the best of my ability, but i don't have all the answers, I'm just a customer service person, not the engineer! I have a PAR meter and when I get the light, I'll do a PAR map. It's not a high end meter but good enough for reasonably accurate map.