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We are playing around with the same Cree LEDs, lots of fun. The 5700K number is most likely a "color temperature" has to do with he color of the light, 5700 looking like daylight (toward the blue end)...

Hi Maxpesh I am interested in knowing the ratio you believe is best for growing, using the Blue & Red spectrum, the ratios blue:red for vegetative and the ratios blue:red for flowering. There is so much erroneous theory out there, it is refreshing to hear from someone who actually knows...