There is a saturation point in which too much light can hurt your plants....the light you have is great bro....just got to learn to use it. Big change from hpsI'd be up to somewhere around 90 or 95 watts per Sq ft .. lol
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your light if i wasn't getting the stretch i needed i would hang it as high as i could my marsII was permanently at the top of my tent(tent size 6 foot 3 inches) i just let them grow into it had a few tall seedlings that had to be propped up but was never a problem led's to close will give you short bushy plants sorry i couldn't be more help dude but you have some great peeps watching out for you and subbed up