stiffer Well-Known Member Jul 2, 2009 #1 hi does anyone here know the percentage of lumen lost by the glass of a cooltube using a 600w hps, (i know you gain them back but putting it closer but im just think if you had it at the same distance as a normal 600)??????
hi does anyone here know the percentage of lumen lost by the glass of a cooltube using a 600w hps, (i know you gain them back but putting it closer but im just think if you had it at the same distance as a normal 600)??????
