Hello ALL! This is my SECOND GROW, 1st HPS. I have been using CFL's for my first complete grow and 20 days of my second. I have 2 Bubble Gum Clones growing under a 600w HPS, in a 4 by 2 by 2 box with Carbon Scrubber and IN/OUT Fans. How far should my light be from the plants? Will it be a problem that I put them under HPS 3 weeks into their 9 week flowing cycle?