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I can keep my 600w HPS 12 inches from my plants i just use a pc fan on at the lvl my bulb is at blowing the air up it works well I went from 19 inches above the plants to 12 and if you look at my pics there loving it.
Would not recommend 12 inches with a 600W HPS. That's way too close in my opinion; even if you had it in a cool tube with an extraction fan. Don't confuse optimal lighting distances with optimal distances based on heat generated.
I've started seedlings under my 400W and my 1000W before; keep the lights up HIGH and it works just fine. Ideal? :dunno: Does it work? Yes. Can it work without stunting your plants? You bet!