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. 2013 Jul 5;8(7):e67798. doi: 10.1371/journal.pone.0067798

Table 2. Photometric characteristics of lamps under direct lighting.

x y CCT CRI MSI IPI SLI Typ. Lumen/W
LPS 0.58 0.42 1720 −47 0.017 0.380 0.088 100–200
HPS 0.53 0.42 2010 19 0.118 0.509 0.231 85
Metal Halide 0.36 0.38 4500 48 0.624 0.640 0.577 120
Halogen 0.43 0.42 3200 92 0.377 0.829 0.597 24
Incandescent 0.48 0.43 2600 93 0.255 0.923 0.490 15
Fluorescent T8 cool-white 0.40 0.39 3730 82 0.435 0.606 0.608 90
LED 5000 K 0.36 0.36 4440 61 0.542 0.636 0.617 100
Philips LED 4000 K 0.38 0.39 4100 63 0.452 0.623 0.563 75
LED 2700 K 0.44 0.39 2760 37 0.285 0.541 0.359 69
Nichia Amber 0.57 0.42 1720 47 0.043 0.682 0.170 53
Lumiled PC Amber 0.57 0.42 1720 36 0.046 0.610 0.154 59
LED 5000 K Filtered 0.47 0.46 2910 55 0.172 0.470 0.380 82
LED 2700 K Filtered 0.52 0.45 2260 34 0.077 0.443 0.230 61
CIE D65 0.31 0.33 6504 100 1.000 1.000 1.000

x and y are the chromaticity coordinates [52], CCT is the Correlated Color Temperature, CRI is the Color Rendering Index, MSI is the Melatonin Suppression Index, IPI is the Induced Photosynthesis Index and SLI is the Star Light Index.