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Light emission spectra of light sources. FL: compact white fluorescence lamp (Phillips Master 13W, color temperature 2,700°K); R:FR 3:1: monochromatic red and far red LEDs at ratio 3:1; R:FR 1:3: monochromatic red and far red LEDs at ratio 1:3. LEDs used for R:FR lighting treatments were FD-39R-Y 3W 740 and FD-33R-Y 3W 660 nm (Shenzhen Fedy Technology Co., China).
