Lighting Cob build question

those numbers are so ridiculous! makes me so so happy i went DIY cobbin than bought one of them...i cant remember where i read about COB's first but someone was saying they would love to see how people growing with MARS lights would do with a straight swap to a COB setup...i bet the results would be insane!
I'll be building my cob set-up this weekend. I was planning on growing some Mephisto double grape but don't know if I can get the beans. I recently grew some sour stompers-pics on here somewhere- under 3 Mars 11 400's and still have beans so I might just do 3 sour stompers under my cob just to see the difference. I'll be replacing about 570 W of Mars lights with app 240 W of cob. However this grow won't start for at least 2 mos..
 
Thank you for all the information I have a lot to think about. The auto cob looks like a good option but I think building my own might be fun. As I mostly have grown outdoor i have a lot learning to do and this site is amazing. Many members with tons of experience and willingness to help
 
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