I believe it has to be an LED green light.....not just any old green lighting.

Huntley, missed that last question completely....sorry......I had some Master Kush that kicked out 4 oz by day 44......the second plant in the same setup went to something like 55 days and gave me 7 oz. Once in awhile you get a speed demon or two.

And phill.......yes, use the penetrator for the best results.