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315w CMH. They work fine and dandy.

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Is there a bigger size unit from the 315cmh? like a 630cmh? 

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yeah, two 315w's  lol


seriously tho, there's a 630w & a 945w all in one ballast in america, cant remember the name of them of the top of my head tho.

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What size room/rent do you have. I was looking at the same thing and after being advised I bought a double 315 set made by maxibright for my 1.2mx1.2m tent. I have seen great veg results so far and am glad I went for both lights. The whole light set up was 450 delivered so really mate I would spend the extra 150 and get the double kit. Find a good eBay shop to buy from as this was where I found mine, look at reviews on the double kits and make sure you buy a double kit and not two singles as it is cheaper.



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