Paul Myland
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View article: Long-Term Analysis of Temperature and Current-Dependent Degradation in Green High-Power Light-Emitting Diodes
Long-Term Analysis of Temperature and Current-Dependent Degradation in Green High-Power Light-Emitting Diodes Open
We report on the degradation dynamics and mechanisms of commercially available green high-power light-emitting diodes (LEDs) with a peak wavelength of 522 nm. The stress tests were carried out for up to 8800 hours with forward currents ran…
View article: Modeling Spectral LED Degradation Using an Unsupervised Machine Learning Approach
Modeling Spectral LED Degradation Using an Unsupervised Machine Learning Approach Open
The modeling of spectral characteristics of light-emitting diodes (LED) has been addressed in various studies. We extend the current state of knowledge by modeling the spectral characteristics of commercially available high-power LEDs, exh…
View article: LED Degradation Monitoring Using a Multi-Channel Spectral Sensor
LED Degradation Monitoring Using a Multi-Channel Spectral Sensor Open
This study explores a novel approach to monitor the spectral emission of LEDs by estimating the spectral power distribution from the spectral sensor responses during an accelerated aging experiment. Two methods for reconstructing the actua…
View article: Sky-like interior light settings: a preference study
Sky-like interior light settings: a preference study Open
This paper explores human observer preferences for various sky-like interior lighting scenarios realized by a combination of a blue-enriched indirect uplight component with a correlated color temperature (CCT) of 6,500 K up to 30,000 K and…
View article: Reconstruction of spectral irradiance in a real application with a multi-channel spectral sensor using convolutional neural networks
Reconstruction of spectral irradiance in a real application with a multi-channel spectral sensor using convolutional neural networks Open
Lighting is not only a key mediator for the perception of the architectural space but also plays a crucial role regarding the long-term well-being of its human occupants. Future lighting solutions must therefore be capable of monitoring li…
View article: Study protocol for measuring the impact of (quasi-)monochromatic light on post-awakening cortisol secretion under controlled laboratory conditions
Study protocol for measuring the impact of (quasi-)monochromatic light on post-awakening cortisol secretion under controlled laboratory conditions Open
Cortisol secretion has a fundamental role in human circadian regulation. The cortisol awakening response (CAR) can be observed as a daily recurring sharp increase in cortisol concentration within the first hour after awakening and is influ…
View article: Processing RGB Color Sensors for Measuring the Circadian Stimulus of Artificial and Daylight Light Sources
Processing RGB Color Sensors for Measuring the Circadian Stimulus of Artificial and Daylight Light Sources Open
The three main tasks of modern lighting design are to support the visual performance, satisfy color emotion (color quality), and promote positive non-visual outcomes. In view of large-scale applications, the use of simple and inexpensive R…
View article: Measurement of Circadian Effectiveness in Lighting for Office Applications
Measurement of Circadian Effectiveness in Lighting for Office Applications Open
As one factor among others, circadian effectiveness depends on the spatial light distribution of the prevalent lighting conditions. In a typical office context focusing on computer work, the light that is experienced by the office workers …
View article: Memory colors and the assessment of color quality in lighting applications
Memory colors and the assessment of color quality in lighting applications Open
Due to their potential use as an internal reference, memory colors may provide an excellent approach for the color rendition evaluation of white light sources in terms of predicting visual appreciation. Because of certain limitations in th…
View article: Tackling Heterogeneous Color Registration: Binning Color Sensors
Tackling Heterogeneous Color Registration: Binning Color Sensors Open
Intelligent systems for interior lighting strive to balance economical, ecological, and health-related needs. For this purpose, they rely on sensors to assess and respond to the current room conditions. With an augmented demand for more de…
View article: Issue 01-2021
Issue 01-2021 Open
For the design of modern office environments, lighting is a central aspect.With regard to current practice, uniform illumination is most often applied in interiors.In this paper, however, further aspects of a more individual approach are i…
View article: Heterogene Farbregistrierung von typgleichen Spektralsensoren
Heterogene Farbregistrierung von typgleichen Spektralsensoren Open
Intelligente Beleuchtung in Innenräumen, welche dynamisch auf die Bedürfnisse des Menschen eingeht, benötigt Sensoren, um die aktuelle Beleuchtungssituation im Raum zu erfassen. Zur Regelung des Beleuchtungsfarbortes sind dabei optische Se…
View article: High‐resolution depth measurements in digital microscopic surgery
High‐resolution depth measurements in digital microscopic surgery Open
Fully digital microscopes are becoming more and more common in surgical applications. In addition to high‐resolution stereoscopic images of the operating field, which can be transmitted over long distances or stored directly, these systems…
View article: Spectral reflectance estimation of organic tissue for improved color correction of video-assisted surgery
Spectral reflectance estimation of organic tissue for improved color correction of video-assisted surgery Open
With video-assisted surgery devices becoming more common in all fields of diagnostics and therapy, the question of how well such systems are able to reproduce surface colors of organic tissue arises, especially in cases where a proper dist…