The reason I say 5 feet is because a 1000 watt HPS is far too much light for the little guys (girls hopefully) to handle. Clones need a soft light and by placing them at 5 feet it will insure their not getting too much light. I don't think the temperature is that much of a concern as long it is well in the limits of regular growth. I have noticed clones will root fine in 20 degree celcius temperatures or 28 degree's, but the later might be a little faster. Sorry for the Celcius, I don't understand Farenheight as well.

Also something that I have found that speeds up root development is to let the rockwool go through a slightly dry stage before watering again. Not dry, but fairly light and a hydro dome should be used so that the leaves can also soak up some water through humidity. I find this dry rockwool stage supplies more oxygen to stem and stimulates calis build up that is the first stages of root development.

Believe it or not I have found that a regular incandecent bulb will root clones just fine. Some people will disagree but I have done it numerous times and have had 100% success rates. I didn't think it would work too well either but I had no other light available the first time I did it so I thought I would try it out. Now that I know more I believe it is because of the high red light spectrum that is emmited from an incandescent.

If your clones are in a hydro dome you have to be careful not to pull the lid off quickly as a draft or a fast change in temperature will droop your clones almost right before your eyes. One thing I would like to know is, is your clone root a constant temp? Even an opening door can cause a slight breeze and that fast change can shock the plants. They usually come back two or three days later as long as the temp stays constant.

Well, enough blabbering. I hope some of this info can help. Good luck and let usa know how she goes.

TGT