The Medicine Man
Head Hydro Honcho
How close are those to the 600w? Only reason I ask is because they look, to me, like they could be fed a little more. I've been experimenting with autos and feed levels and higher intensity light. I've been able to feed 3 week old autos a full on 2.2 EC (1100ppm at .5) and they love it. They needed it. I was feeding half that as my normal feed but they were so pale. Once I upped that feed it was night & day difference. In the pictures your plants look like they might be a little pale. No where near what mine were, but just something to think about. I see no evidence of burn or anything on your plants, so they could be pushed a little more if you wanted to see a bigger yield. Just be careful and add a little more at a time. Like move to 3/4 strength, see if they like it, and if no burn move to full strength. A lot of autos under higher intensity lights can handle full strength nutrients.