Table 3.
White light spectrum |
Target CS | Mean ± SEM suppression after 1 h (%) |
Predicted CSa | Analysis |
---|---|---|---|---|
2700 K | 0.07 | 2.5 ± 2.8 | 0.06 | t32 = −1.2, p = 0.23 |
0.14 | 7.1 ± 2.6 | 0.11 | t32 = −1.5, p = 0.15 | |
0.30 | 17.0 ± 5.0 | 0.27 | t30 = −2.0, p = 0.06 | |
0.50 | 38.7 ± 3.9 | 0.45 | t30 = −1.6, p = 0.12 | |
6500 K | 0.07 | 4.8 ± 2.8 | 0.06 | t32 = −0.4, p = 0.67 |
0.14 | 7.7 ± 3.0 | 0.11 | t28 = −1.1, p = 0.28 | |
0.30 | 28.1 ± 3.1 | 0.28 | t31 = 0.03, p = 0.98 | |
0.50 | 43.2 ± 3.1 | 0.46 | t30 = −0.9, p = 0.38 |
Note:
Predicted CS values were calculated based upon the Rea et al. (Rea et al., 2005; Rea et al., 2012; Rea and Figueiro, 2018) model of circadian phototransduction (Equations 1 and 2) using the absolute spectral irradiance measurements from the spectrometer, undertaken during each study night to estimate the actual corneal light stimulus delivered to the participants.