As a new grower, all I can go off of is this light so far. And it seems to rocketh the casbah. For the auto's I kept the light on veg until time to flower then flipped on both veg and flower switches. 18-22" seems to be the sweet spot for the plants. Never really had any burn issues. The heat never really exceeded 80 on the temps in the tent and that was during extremely hot days, most of the time it idled around 70 degrees.
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