I would guess you have your lights too close. Actually 600 watts in a space that size sound like the leaves don't feel like getting up in the morning so they just stay in bed. I would try raising the light for a few days.
Starting my first grow. The breeder says the free-be seeds are 08' UK Cheese x Cinderella 99. This grow is to learn the ropes. I have zero experience and any advise is welcome. I saw the main-lining technique and I thought why not, looks like a smart way to grow. As for the grow room, I...