Table 1.
Light exposure at eye level (vertical plane) for the two light conditions.
| Short-Wavelength Narrow-Bandwidth Light | Long-Wavelength Narrow-Bandwidth Light | |
|---|---|---|
| Mean (SD) | Mean (SD) | |
| Peak spectral irradiance (nm) | 455 | 625 |
| Irradiance (µW/cm2) | 125.0 (5.4) | 82.6 (4.9) |
| Photopic illuminance (lx) | 60.8 (4.0) | 195.9 (10.6) |
| Melanopic EDI (lx) | 584.5 (23.0) | 4.1 (1.6) |
| Photon density (photons/cm2/s) | 2.9 × 1014 (1.4 × 1013) | 2.6 × 1014 (1.5 × 1013) |
| Human photoreceptor responses (irradiance—µW/cm2) | ||
| S-cone-opic | 97.0 (3.9) | 0.2 (0.1) |
| M-cone-opic | 23.7 (1.0) | 9.5 (0.6) |
| L-cone-opic | 14.6 (0.8) | 38.3 (2.0) |
| Rhodopic | 63.5 (2.5) | 1.3 (0.2) |
| Melanopic | 77.5 (3.1) | 0.5 (0.2) |
Note: Light was measured in the beginning, middle, and end of each night shift at two desk spaces. Lighting parameters computed according to the CIE S 026 Toolbox—version 1.049 [45]. EDI = equivalent daylight illuminance.