d4, no Ike problems here. we floridians (read: native) tend to not go as crazy as the rest untill its on the doorstep. I saw the image of the three hurricanes last week and had little worry that wed be spared:jointsmile:

hawk, id say 15mm but im not positive. the link in our sig works for me....its also a stickied thread at the top of the grow log forum if you cant get there from here. http://boards.cannabis.com/grow-log/...-grow-log.html

if youre building an array, the guys in The perfect LED grow light could possibly help you. they know tons of info about all the angles, there is a bit of discussion going on in there but just ask a ? and im sure they'll know(lol...realized you just asked for a distance measurement, gee real technical db...lol...laughing at myself:jointsmile

db:smokin: