Details are as follows: 4x4x6 ft. grow box, 4 clones in bubble buckets, 600w HPS bulb, 200 cfm fan w/ carbon filter, and lots of mylar. Heres my issue: The ladies are now in week 3 of flowering (12/12 light cycle) and their vertical growth is still pretty vigorous. Buds are beginning to form at nodes and swelling. Being that we have an HPS bulb, i'm afraid of them getting burned. They've got about another 1.5 to 2 ft. of growth space, but thats it. Any suggestion for avoiding such a scenario?