Planting a clone can often stress it for an entire week. this is the time when you want to make sure you do not damage them because they are at their most vulnerable. Keeping the 2 feet away is fine at this stage. Once you feel that they have adjusted to the different light and are looking stronger, like said, slowly lower the plant and monitor it often. Depending on how established the clones really are, things can do sour real quick if you lower it to quickly. But if they can handle the 1000 watt from 2 feet away with no wilting at all...you could probablly lower soon. I would wait until you see new growth coming out and then lower it.