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i guess you have a 3-4ft tall plants then with a reflector this is your data sheet for 600w lumens

this are base on my estimation if reflector is present and play a big part in lumens concentration on a focal point this is a sheet of estimation

what are the reading in plain white. im curios hahahah

thanks for this formula dont have that device yet. but thanks for the link slipon. i know this is an old thread. im new here and just lurking around learning many thing from the site before i start my first grow this year. this is to shed more light on Inverse sqr law.. i tried to compute...