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1000 hps to 400 hps

Discussion in 'Absolute Beginners' started by katie, Dec 8, 2003.

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  1. i had already set up a 1000 watt hps with ballast and now i am thinking to change to 400 watt hps instead due to expensive electricity bills, question is do i need to do anything on the existing ballast before i can put a 400 watt hps on, or i just need to swap the bulb????
     

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