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ballast question

Discussion in 'Indoor Marijuana Growing' started by houstonstonie, Sep 26, 2003.

  1. okay im a lil confused on the ballast thing??? what is it?? is it the grey box that comes with the hps and what does it do???????????????

  2. yeah its that box and it ups the voltage of the mains electric to the much higher voltage a HID light needs to run.

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