Also, forgot to mention this, the temps sound a little low. I would have them up to 75 at least w/ lights on. This may have nothing to do w/ anything just a misc. thing that I saw. Really to veg from seed, and I have no idea what your plans are, but really you can veg under the T12s, T5s, whatever, and that will reduce your stretch significantly. Much cheaper, wal-mart, 60-70 bucks, 2 2x4 t12 fixtures, then the bulbs, and that really all you need, save that HPS for flower. Another thing though, is that if you are running a 600 watt HPS now and your temps are that low, you may need to figure something out to compensate for the lack of heat you would be putting out w/ a floro set as compared to a HPS. Just a thought though good luck.:jointsmile: