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    Is 630w double ended CMH too intense for 6ft ceilings?

    I'm setting up my first inside grow. Moved to Fairbanks and the sun is tricky here. I want to put my money into something versitile. I was thinking of going with 1000w de ballast turned down to 600 and running 630 de cmh. Then when I need supplemental lighting in my green house in the fall I...