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Can anyone enlighten me as to how driver efficiency works when dimmed? I tried to make sense of the PF-P400CC-C140's datasheet (http://en.hzzhpower.com/upLoad/product/month_1601/PF-P400CC-Cxxx-S(U)-XX.pdf) but the graph on page 5 start's at 60%. What happens when dimmed down really low? Is it a...

Will the driver still be running efficiently eight COBs at 700ma? Or should I get the HLG 185H C700 for that constellation? It would be nice to have that extra power, in case I want to double my grow space. But for now I would be happy to run the COBs at 500-700ma.