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Hi, larsel 
Other than possibly some side lighting, and only if desired for low bud yield, you should be fine with just a 300w Mars. I've done several grows with just one 300, and got very respectable results! Make sure you have a cal/mag additive... Word.
Best to you!:Sharing One:
Other than possibly some side lighting, and only if desired for low bud yield, you should be fine with just a 300w Mars. I've done several grows with just one 300, and got very respectable results! Make sure you have a cal/mag additive... Word.Best to you!:Sharing One:
