Skip to main content
. Author manuscript; available in PMC: 2020 Apr 1.
Published in final edited form as: J Biol Rhythms. 2019 Feb 25;34(2):178–194. doi: 10.1177/0748730419828056

Table 1.

Mean ± standard deviation (SD) photopic illuminances (in lux) obtained during the study days using the spectrometer and the corresponding predicted CS values obtained using the spectrometer data and the Rea et al. model of circadian phototransduction (Rea and Figueiro, 2018).

Target
CS
White light
spectrum
Adolescents Adults
Photopic
Illuminance
(lux)
Predicted CSa Photopic
Illuminance
(lux)
Predicted CSa
0.07 2700 K 53 ± 9 0.06 ± 0.01 56 ± 13 0.07 ± 0.01
6500 K 32 ± 4 0.06 ± 0.01 31 ± 5 0.05 ± 0.01
0.14 2700 K 100 ± 26 0.11 ± 0.03 109 ± 17 0.12 ± 0.02
6500 K 62 ± 5 0.11 ± 0.01 66 ± 10 0.11 ± 0.02
0.30 2700 K 282 ± 51 0.27 ± 0.06 290 ± 39 0.27 ± 0.05
6500 K 195 ± 35 0.27 ± 0.06 213 ± 49 0.29 ± 0.08
0.50 2700 K 747 ± 102 0.45 ± 0.12 773 ± 116 0.45 ± 0.13
6500 K 467 ± 65 0.44 ± 0.11 536 ± 84 0.47 ± 0.14

Note:

(a)

The predicted CS values are based on a 1-h exposure.