Table 4.
Characteristics of the three different light conditions.
| Dim light | 1 h light exposure (at 22:30) | Prior light exposure (18:30-21:00) | ||
|---|---|---|---|---|
| Illuminance (lx) | 5.0 | 777 | 1227 | |
| CCT [K] | 3888 | 3888 | 3934 | |
| Lucas et al., 2014 | “Cyanopic-lx” | 2.4 | 376 | 608 |
| “Melanopic-lx” | 3.8 | 596 | 953 | |
| “Rhodopic-lx” | 4.2 | 651 | 1036 | |
| “Chloropic-lx” | 4.6 | 708 | 1122 | |
| “Erythropic-lx” | 4.9 | 764 | 1205 | |
| CIE S 026/E:2018a | S-cone-opic EDI (lx) | 2.5 | 385 | 623 |
| M-cone-opic EDI (lx) | 4.5 | 692 | 1096 | |
| L-cone-opic EDI (lx) | 5.0 | 779 | 1228 | |
| Rhodopic EDI (lx) | 3.8 | 590 | 939 | |
| Melanopic EDI (lx) | 3.5 | 540 | 863 |
Photopic illuminance (lx), correlated colour temperature (CCT) and the corresponding human retinal photoreceptor weighted “α-opic (equivalent) illuminances” and α-opic equivalent daylight (D65) illuminances (α-opic EDI) calculated according to Lucas et al.61 and CIE S 026/E:201862 respectively.
aeach α-opic EDI value gives the amount of lx of standard daylight D65 (phase of daylight with a CCT of approximately 6500 K) which results in an identical α-opic irradiance (i.e., the effective photobiological radiance with the spectral irradiance spectrally weighted with the α-opic action spectrum) as the test light condition, see international standard CIE S 026/E:201862.