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Table 1 Characteristics of light sources

From: Suppression of vagal cardiac modulation by blue light in healthy subjects

  Red Green Bluea Blue 5 Blue 2
Illuminance, lx 39 71 10 5 2
Irradiance, W/m2 0.20 0.14 0.07 0.03 0.01
Chromaticity (x, y) (0.63, 0.34) (0.33, 0.62) (0.14, 0.16) (0.14, 0.16) (0.14, 0.16)
Photon flux density, μmol/(m2 s) 1.05 0.64 0.26 0.13 0.05
Melanopsin-stimulating photon flux density, μmol/(m2 s)b 0.00 0.10 0.20 0.10 0.04
  1. aBlue light with 10-lx illuminance was used for both studies 1 and 2
  2. bCalculated from melanoptic spectral efficiency adjusted for human pre-receptoral filtering [7, 8]