My seedlings are about 10 days old, I have a 600watt Metal Halide & i was wondering a healthy time to put them in the MH 600w room. There 6 Plants under 2 CFL right now
It's a tough question without knowing all about your grow. Air flow, temperature, etc. Add to that I have never grown with a 600 watt mh and take the following with a grain of salt... I've grown from breaking ground with a 1000 watt HPS, so it can be done at anytime as long as your dialed in on your grow. I would say 10 days from sprouting is enough time and growth to transfer them under the MH. If you are really nervous, wait another 4 days or so but personally I would hate to lose the growing power of the MH during those 14 days.
ive had my seedlings under my 400 watt mh since day one and they couldnt be happier. i just keep the light far away at first and slowly lower it so they have a chance to get used to it. u could also dim it a bit but they should be fine. if anything after a week they will definitely be ready for it.