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Table I-1. Spectral distribution characteristics of incandescent (INC), high-pressure sodium (HPS), and compact fluorescent (CFL) lamps, and red (R)+white (W)+far-red (FR), cool-white (CW), and warm-white (WW) light-emitting diodes (LEDs) between 400 and 800 nm. Data are based on measurements made at Michigan State University and the estimated phytochrome photoequilibria values (PFR/PR+FR) are estimated according to Sager et al. (1988). Parameter INC HPS Percentage (%) of photon flux (400−800 nm) CFL 14 37 42 7 6.19 0.32 0.83 LEDs R+W+FR CW WW 6 20 12 13 46 39 36 30 43 44 4 6 0.82 7.47 7.18 0.18 0.67 0.27 0.67 0.84 0.84 Blue (B; 400−500 nm) Green (500−600 nm) Red (R; 600−700 nm) Far red (FR; 700−800 nm) Light ratio R:FR B:R PFR/PR+FR 3 5 14 51 30 38 54 6 0.56 5.90 0.09 0.12 0.64 0.86 18PDF Image | LED REGULATE FLOWERING OF PHOTOPERIODIC ORNAMENTAL CROPS
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