Wouter Ryckaert
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View article: A CONTINUOUS RATING EXPERIMENT TO TEST THE FEASIBILITY OF WORKING WITH HIGH-LUMINANCE MONITORS TO INCREASE LIGHT AT EYE LEVEL
A CONTINUOUS RATING EXPERIMENT TO TEST THE FEASIBILITY OF WORKING WITH HIGH-LUMINANCE MONITORS TO INCREASE LIGHT AT EYE LEVEL Open
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, p…
View article: The effect of correlated colour temperature and wall luminance on spatial brightness and scene preference in a windowless office setup
The effect of correlated colour temperature and wall luminance on spatial brightness and scene preference in a windowless office setup Open
This study explores the impact of wall luminance and correlated colour temperature (CCT) on the observers’ brightness perception and scene preference in a controlled, windowless office environment. A two-interval-forced-choice experiment w…
View article: Programmable freeform optics with extended white light sources: possibilities and limitations
Programmable freeform optics with extended white light sources: possibilities and limitations Open
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 neede…
View article: Comment Concerning the Effects of Light Intensity on Melatonin Suppression in the Review “Light Modulation of Human Clocks, Wake, and Sleep” by A. Prayag et al.
Comment Concerning the Effects of Light Intensity on Melatonin Suppression in the Review “Light Modulation of Human Clocks, Wake, and Sleep” by A. Prayag et al. Open
Dose-response curves for circadian phase shift and melatonin suppression in relation to white or monochromatic nighttime illumination can be scaled to melanopic weighed illumination for normally constricted pupils, which makes them easier …
View article: Compact illumination system with variable beam direction and beam divergence
Compact illumination system with variable beam direction and beam divergence Open
Countless approaches to optimise lighting conditions for indoor and outdoor applications are described in the literature by adaptive dimming schemes or control algorithms. Those methods rely on adapting the emitted flux of individual lumin…
View article: Human Centric Lighting: The impact of light on sleep and attention of factory shift workers
Human Centric Lighting: The impact of light on sleep and attention of factory shift workers Open
Introduction Increased blue-enriched morning light is often said to support circadian rhythm synchronization. Through a better sleep quality, one's cognitive and emotional functioning can also be enhanced. However, it is unclear which ligh…
View article: A Comparison of Partition Scaling and Magnitude Estimation for Brightness Scaling
A Comparison of Partition Scaling and Magnitude Estimation for Brightness Scaling Open
sponsorship: This research was supported by Impulse Fund KU Leuven (IMP/16/027 -"Correlaties tussen objectieve en subjective descriptoren van binnenverlichting"), granted to W. R. Ryckaert and Marc Dujardin. Kevin A. G. Smet was supported …
View article: Multi-channel freeform optics for glare-free lighting
Multi-channel freeform optics for glare-free lighting Open
Glare and visual discomfort are important factors that should be taken into account in illumination design. Conventional freeform optics offer perfect control over the outgoing intensity distribution, but few control over the near-field lu…
View article: Luminance spreading freeform lens arrays with accurate intensity control
Luminance spreading freeform lens arrays with accurate intensity control Open
Glare and visual discomfort are important factors that should be taken into account in illumination design. Conventional freeform lenses offer perfect control over the outgoing intensity distribution, thereby allowing optical radiation pat…
View article: Derivation of Brightness Scales Using Partition Scaling
Derivation of Brightness Scales Using Partition Scaling Open
To capture the relationship between the magnitude of an optical stimulus (e.g. luminance) and its perceived brightness, a number of psychophysical procedures can be used. One of the oldest procedures capable of capturing such a relationshi…
View article: Efficient Design Method of Segmented Lenses for Lighting Applications with Prescribed Intensity and Low Peak Luminance
Efficient Design Method of Segmented Lenses for Lighting Applications with Prescribed Intensity and Low Peak Luminance Open
© 2018, © 2018 Illuminating Engineering Society. Light emitting diodes (LEDs) that are used today in general lighting applications provide high luminous flux from small packages, which can result in high peak luminance and glare. The use o…
View article: Receptive Field Mechanism and Pupilary Light Reflex for the Assessment of Visual Discomfort
Receptive Field Mechanism and Pupilary Light Reflex for the Assessment of Visual Discomfort Open
Discomfort glare is defined as glare that causes discomfort without necessarily impairing the vision of objects. Traditional glare metrics fail for non-uniform luminaires. As an alternative, visual discomfort is determined by a physiologic…
View article: Colour Appearance Modelling For Self-Luminous Colours
Colour Appearance Modelling For Self-Luminous Colours Open
An experimental setup and procedure for the evaluation of self- luminous colours viewed against both dark and luminous backgrounds is presented. Physical and visual data of self-luminous colours is gathered in order to develop a Colour App…