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. Author manuscript; available in PMC: 2021 Sep 1.
Published in final edited form as: J Safety Res. 2020 Jul 10;74:169–177. doi: 10.1016/j.jsr.2020.06.003

Table 1.

Specifications and order of the three lighting interventions administered to the study’s three participant groups.

Lighting intervention λmax (nm) FWHM (nm) Illuminance at the eyes (lx) CS Intervention order, by participant group
Group 1 Group 2 Group 3
Red (treatment) 630 24 50 <0.01 2nd 1st 3rd
Blue (positive control) 460 20 50 0.60 1st 3rd 2nd
Dim white, 3000 K (placebo control) — — 10 0.01 3rd 2nd 1st

λmax = peak wavelength, FWHM = full width at half maximum, CS = circadian stimulus.