I am teeling you what...the sooner you get those babies under the MH you will be amazed. Keep the bulb about 18 in away and they should be alright...really once you have the bulb setup and on and what not put your plants in the area and then reach in and put your hand right over the tops of your plants. If your hand is burning then so will your plants. So just move the light so it doesn't burn you and the plants will be fine.
Grew these with cfls. 1st grow didn't go well but I've learned so much from all you guys and I'm so proud of these, just had to post. 8 weeks old and starting 2nd week of 12/12. Link for hps set up above didn't mention any warrenty and was so much cheaper I was alittle scared of the offer.