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Explore our research lab's past publications and delve into the discoveries that have helped shaped our field.

Comparing performance of discomfort glare metrics in high and low adaptation levels (2021)

This paper investigates the ability of current glare indicators to predict perceived discomfort glare in user-evaluated scenes depending on two different adaptation levels. Towards this end, we used a composite dataset of six laboratory studies performed previously and separately in various parts of the world. According to Receiver Operator Characteristics (ROC) findings and complementary statistical research, the hybrid metrics DGP and Eccologit perform best in both investigated ranges (dimmer and brighter scenes). For the single-effect metrics, the contrast-driven metrics appear to perform better than saturation-driven metrics in lower adaptation levels (dimmer scenes), while the reverse is seen in higher adaptation levels (brighter scenes). 

User Evaluations of Contrast-Dominant Discomfort Glare in Dim Daylit Scenarios: Preliminary Findings (2021)

We hypothesize that the contrast effect may dominate in low-light scenarios such as those commonly found in open-plan offices. Thus, we designed and carried out a user study in controlled laboratory conditions with 63 participants with a total of 252 scenes to investigate discomfort glare evaluations in dim daylight office environments with low adaptation levels. Our preliminary findings support our hypothesis that contrast-driven metrics predict glare responses in a more reliable way than hybrid metrics at low adaptation levels where the contrast effect dominates, which underlines the need for refining glare metrics in low brightness conditions.

Spatial evaluation of potential saturation and contrast effects of discomfort glare in an open-plan office (2021)

This paper analyzes the relative distribution of annual saturation and contrast effects of discomfort glare in an example deep open-plan office. To identify viewpoints where saturation and contrast effects of glare dominate, a synthetic and versatile spatial visualization approach was established. A new simulation method allowed us to calculate detailed annual saturation and contrast metrics in a reasonable timeframe. Results show that high contrast lighting conditions occur far more frequently than high saturation conditions except for a narrow area near the façade. 

Calibration and Validation of Climate-Based Daylighting Models Based on One-Time Field Measurements: Office Buildings in the Tropics (2019)

This paper proposes and presents a calibration process for annual daylighting and electric lighting simulation models based on one-time field measurements of large daylit and electrically lit spaces exemplified through a data set of 540 individual office desks across 10 office spaces. The calibration process includes measuring lighting, physical, and material data during a one-time visit that are used to calibrate high dynamic range images and lighting simulation models using actual weather data. The calibration accuracy is validated based on measured and simulated luminance and illuminance data. 

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