Publications
A CONTINUOUS RATING EXPERIMENT TO TEST THE FEASIBILITY OF WORKING WITH HIGH-LUMINANCE MONITORS TO INCREASE LIGHT AT EYE LEVEL KU Leuven
Adequate indoor lighting should compensate for the lack of daylight by providing more light at eye level. Employing High Dynamic Range (HDR) monitors with high-lumen output could be a way to accommodate this need for more light. However, people will dislike working with a monitor if it is too bright for the environment. Therefore, a visual experiment was conducted, evaluating reading comfort on a continuous rating scale under various monitor and ...
Correlation between objective and subjective descriptors of a lit indoor environment KU Leuven
Most of the existing indoor lighting standards and guidelines focus on some quantitative aspects of light and lighting conditions, setting certain minimum requirements for the (maintained) illuminance, glare and colour rendering. Complying with standards does not guarantee an attractive or personal lighting scene but tends to result in rather 'indifferent' lighting concepts. However, it will eliminate lighting designs which do not reach the ...
Road marking BRDF model applicable for a wide range of incident illumination conditions KU Leuven
To drive safely and comfortably, an adequate contrast between the road surface and road markings is needed. This contrast can be improved by using optimized road illumination designs and luminaires with dedicated luminous intensity distributions, taking advantage of the (retro)reflective characteristics of the road surface and road markings. Since little is known about road markings' (retro)reflective characteristics for the incident and viewing ...
Programmable freeform optics with extended white light sources: possibilities and limitations KU Leuven
Freeform optics can be used in lighting applications to generate accurate prescribed illumination patterns from compact light sources such as LEDs. When targeting dynamic illumination systems, a time-variable optical functionality is needed. Phase-only spatial light modulators (SLMs) have been used in the past for various dynamic beam shaping applications with monochromatic, zero-étendue illumination under paraxial conditions. Such limitations ...
Improved Method for Evaluating and Specifying the Chromaticity of Light Sources KU Leuven
This article describes a method for calculating and specifying light source chromaticity using the International Commission on Illumination (CIE) 2015 10° color matching functions (CMFs), which, according to analysis of existing psychophysical experiment data, can reduce visual mismatch compared to specifications based on the traditional CIE 1931 2° CMFs in architectural lighting applications. Specifically, this work evaluates, documents, and ...