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    Fan speed controller advice

    You probably want something like a Variac if you care about noise. Check the manual for your fan, it will define what type of regulation (voltage or frequency) your fan supports. Most, if not all, will respond perfectly to voltage regulation, slowing speed and therefore reducing sound. Only some...
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    D.I.Y. Solar Power? Possible?

    Yes! Check this thread. https://www.opengrow.com/topic/46169-a-free-energy-test-grow/
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    Noob question about CMH Lights

    I have a Phillips 400W CMH (Open Fixture rated). This is my first time using it, and I'm using it in combination with a 600W HPS. I ran it in my 4'x4' tent with no active cooling and no lens for the first few days of seedling life for my girls, and it was quite cool. I didn't have a 400W HPS...
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