Don't say anithig about light intensity before you read and see the crop of mine)
From some older posts:
1. Low intensity of PAR (minimally admissible) - a range of intensity at which growth of vegetative bodies occurs, but are not formed high-grade generative bodies (bud). Thus photosynthesis has low parameters. For photophilous plants it is intensity in a range 15-30 w/m^2
2. Optimum intensity PAR - a range of intensities at which the maximal accumulation of a biomass in unit of time is observed. Thus The part of a useful part of a crop to sheathe makes 50-70 %. Photosynthesis and growth are well balanced. For photophilous plants it is a range of PAR 150-220 w/m^2
3. Sating intensity of PAR - the maximal intensity of light at which the output of photosynthesis on a plateau of light saturation is reached, ie maximal photosynthesis. Thus, growth inhibition of a stalk and other axial bodies is observed - plants get the undersized form. The part of a useful part of a crop to sheathe is high, but the general biomass collects less, than at optimum intensity as growth is braked (400 PAR w/m^2 and more), requres tripple nutrition feeding

LED 40x70 lighter produces 76 PAR watts and if you convert it in metres which is 270PAR watts /m^2, which is 50 watts more than so called optimum par intensity (2). But far away from 400parwatts/m^2. However these calculations are approximate, to obtain clear scientific light intensity must be measured or the yields of plants under various lightening must be compared.
Goal 560 plants 20 lamps of mine
cture Reviewed by cture on . Hi folks! It's been a long time since my last post http://boards.cannabis.com/indoor-growing/96301-what-light-spectrum-curve-absorbed-cannabis.html#post1159985 Finaly I have Assembled my LED lights and now growing using them. Photos comming soon... (tomorrow):thumbsup: Rating: 5