## 3 Results
### Spectral Illuminance Measurements, Automation Scenario, and Luminance Distribution  
The new lighting system was installed according to the outlined design. Impressions are shown in Figure 5. Dimming levels were set in each area by simultaneously measuring illuminance and MEDI at the workplaces. The dimming level and CCT can be set separately for every luminaire and every component (direct and area). The automation consisted of the following sections discussed below. The time gaps between the sections are fading times. Figure 4: Simulation results for the photopic and melanopic models. The top panels show a visualization of the lighting scenario. The use of color is purely qualitative. Middle panels show the photopic illuminance at task level (lx, 1.0 m height) in a false-color scale floor plan. The bottom panels show the scales and the MEDI (lx, 1.5 m height) in a false-color scale floor plan. (**a**) Stock lighting. An approximate lighting distribution was used for the tub lights. Fluorescent lamp specifications were according to the fitting found on site (mostly \(2\times 58\) W). (**b**) Morning scenario with a high melanopic setting. (**c**) Night-time scenario with a low melanopic setting. Figure 5: New lighting system after commissioning. 1. From 6:15 a.m. to 10:45 a.m., the melanopic stimulus was set high for the morning shift for activation and synchronization (Mel high). 2. From 11:00 a.m. to 2:00 p.m., the light was in a neutral setting for the morning shift (Mel neutral). 3. From 2:15 p.m. to 3:15 p.m., the setting was identical to A., but for the evening shift for activation (Mel high). 4. From 3:30 p.m. until one hour before sundown, the setting was identical to B., but for the evening shift (Mel neutral). 5. From one hour after sunset, until 2:00 a.m., the melanopic stimulus was set minimal for the night shift (Mel low). 6. At 6:00 a.m., the melanopic stimulus was still set low, but higher compared to E (Mel low+). The exact measurements for the _quality control_ and _packaging_ workplaces are shown in Figure 6 and Table 2. The large differences in melanopic values at eye level with comparatively little differences in photopic values at task level are possible by selectively dimming the direct and area components of _Drosa_, although changing the CCT of the area component plays an important role (within a reasonable limit of 3000-7000 K). Since the direct component always stays at 4000 K CCT, the visual task is not impaired by changes in color temperature. Figure 6: Measurement results and automation schematics for the new lighting system at the _quality_ control workplaces. The top panels show the horizontal illuminance (lx, orange) and the vertical MEDI (lx, blue). The middle and bottom panels each show the spectral measurement result for one melanopic setting as explained in the main text, alongside a 180\({}^{\circ}\) fisheye photograph of the workspace during the light setting. The dashed curves show the raw spectrum (solid line, colored in) when multiplied with the melanopic sensitivity curve. As can be readily seen from Table 2, the lighting system works very differently between the two workplaces. For one, the background illuminance in both places is different, stemming from other lights in the industrial hangar. Background illuminance is quite minimal at _quality control_ (9 lx MEDI) and substantial at _packaging_ (75 lx MEDI). As there were no tub lights above _packaging_ before the new design, the backlight illuminance is equal to the stock illuminance (see Table 1). Consequently, this acts as a lower threshold for the _packaging_ workplace that interferes with the MEDI goals for the night shift. Another interesting observation is the comparison of measurements with and without FOV obstruction. In the case of the _quality control_ workplaces, these values differ only by about 3-4%, meaning almost all of the light at this viewing position reaches the eye within the field of view.