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I personally would not use cheap knock offs. I use only Philips Luxeon ES 660nm Deep Reds and 440-450nm Royal Blues from Steve's LEDs, because he carries specific bins that are the highest output and always consistent on Vdrop and bandwidth. I bet I've ordered over 1000 660s from him in the last 6 months. Every other source, including Rapid, is basically a grab-bag of random bins. You get what you pay for.
What size should I expect to make to be successful in a 210 gallon tank?