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lighting question.

  1. dlchobbes

    Light change at transition

    Hi, I hope someone has the answer to this question. The first 4 weeks of my grow I used an overhead lamp with a 600 Watt Metal Halide bulb and 4 four foot long T5's at 54 watts. The next 8 weeks will be spent using a 600 watt HPS (high pressure sodium?) bulb overhead and my question is: Can I...