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New Grower 600w HPS for 4x4?

Rule of thumb is 50 watts/sq ft

So unless my math is wrong, 600 is spot on.

But heat will be an issue. I have 400 watts in a 4x2 tent, and I can't grow in the summer. You are going to want a lot of ventilation.
Don't be @late for the party. You my auto flower friend need a couple of AutoCobs to party all summer long with us........:thumbsup:
 
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