... wavelength can be specified by the customer, we suggest that red light wavelengths using 620-630 and 640-nm 660 nm, blu ... use 450-460 nm wavelength and 460-470 nm. The red light promote plant sprouts, flowering, blu-ray promote plant growth, and ... above products parameters for the lamps conventional proportion (blu-ray: red light = 1:8) parameters, is for reference only, the customer can ...