I experimented with my pair of "600" watt cheapy Vipars ( 285 watts actual each ) by raising them to 30" and leaving them there. Surprizingly, no light dep stretch at all! Just BIG healthy plants. I'm going to continue running these lights high from the beginning for a while and see how it works with other strains. Ohh, and I just had to raise them again....... at about 18" now. Here are the plants:
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