Figures & data
Fig. 1. Visualization of the three experimental lighting conditions and measurement protocol of one session. IL = intermittent light, BL = bright light, DL = dim light, Ass nr = assessment number.
![Fig. 1. Visualization of the three experimental lighting conditions and measurement protocol of one session. IL = intermittent light, BL = bright light, DL = dim light, Ass nr = assessment number.](/cms/asset/df751a06-f957-4b7e-ad56-c92b23f17699/ulks_a_2068573_f0001_b.gif)
Fig. 3. Normalized spectral power distribution of the bright (solid line) and dim (dotted line) light settings.
![Fig. 3. Normalized spectral power distribution of the bright (solid line) and dim (dotted line) light settings.](/cms/asset/217278b9-5004-4ccb-bc26-d54cf3f74459/ulks_a_2068573_f0003_b.gif)
Table 1. Illuminance, CCT, Color fidelity index, α-opic EDI, and α-opic DER of the light settings (at the eye position).
Table 2. Upper (ΔU) and lower (ΔL) equivalence bounds that were used in the equivalence test for the alertness-related parameters.
Fig. 4. Temporal trajectory of a) vitality, b) sleepiness, c) mean reaction time for PVT, d) standard deviation for the PVT, e) mean reaction time for the 10% slowest responses of the PVT, f) coefficient of variation for the PVT, g) mean reaction time for the 10% fastest responses of the PVT, and h) PVT motivation. The graphs are based on the models without the correction for time in session. The error bars represent SE.
![Fig. 4. Temporal trajectory of a) vitality, b) sleepiness, c) mean reaction time for PVT, d) standard deviation for the PVT, e) mean reaction time for the 10% slowest responses of the PVT, f) coefficient of variation for the PVT, g) mean reaction time for the 10% fastest responses of the PVT, and h) PVT motivation. The graphs are based on the models without the correction for time in session. The error bars represent SE.](/cms/asset/ee2d9115-224f-4885-8890-0056cb727e20/ulks_a_2068573_f0004_b.gif)
Fig. 5. Temporal trajectory of a) mean SCL, b) calm, c) happy, d) sensation of light intensity, e) sensation of color temperature, f) visual acceptance (in % – no statistical testing), and g) visual comfort. The graphs are based on the models without the correction for time in session. The error bars represent SE.
![Fig. 5. Temporal trajectory of a) mean SCL, b) calm, c) happy, d) sensation of light intensity, e) sensation of color temperature, f) visual acceptance (in % – no statistical testing), and g) visual comfort. The graphs are based on the models without the correction for time in session. The error bars represent SE.](/cms/asset/00d55443-394c-4506-999b-acf604589b40/ulks_a_2068573_f0005_b.gif)
Supplemental Material
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Download PDF (99.6 KB)Data availability statement
The coded collected data is available to the general public in an online data repository (10.17605/OSF.IO/BSA9N).