Grow4tho187
Well-Known Member
Gh flora nova bloom is good stuff too !
Agreed but best rule of thumb is to use the hand method hold your hand at top of plants and imagine it there for hours I had my 600 way too close bleached my plant a little but moved it up good 6-8 inch's I would say they can penetrate good.With a cooltube as you have, you can easily have the HID closer than 18 inches. Try about 8 - 12inches and see how they respond! Room looking very neat.