A5090333738- Impact of Light on Environment and Health
- Building Energy and Comfort Optimization
- Color Science and Applications
- Color perception and design
- Circadian rhythm and melatonin
- Sleep and Wakefulness Research
- Design Education and Practice
- Visual and Cognitive Learning Processes
- Urban Heat Island Mitigation
- Sleep and related disorders
- Experimental Learning in Engineering
- Learning Styles and Cognitive Differences
- Ocular and Laser Science Research
- Noise Effects and Management
- Ergonomics and Musculoskeletal Disorders
- Urban Green Space and Health
- Advanced Multi-Objective Optimization Algorithms
- Engineering Education and Pedagogy
- Multisensory perception and integration
- Facilities and Workplace Management
- Visual perception and processing mechanisms
- Olfactory and Sensory Function Studies
- Green IT and Sustainability
- Architecture, Art, Education
The University of Sydney
2014-2024
Electric lighting plays a critical role in buildings, not only impacting the well-being, satisfaction, and performance of building occupants but also accounting for significant portion energy consumption. The commonly used efficiency metrics lighting, such as luminous efficacy or power density, fall short quantifying effective light architectural spaces. To address shortcomings existing measures, application that characterizes efficient delivery from source to target should be utilized....
In a psychophysical forced-choice experiment, observers' ability to detect illuminance differences was found be 7.4% of the initial illuminance. When matching one space with another, acceptance 17.8% 19.1%. Lighting control systems resolutions between 14.8% and 17.7% were have greater usability than others. A new approach step-dimming leverages knowledge detectability acceptability differences, as well usability, reduce lighting energy consumption. This method can consumption more continuous dimming.
Lighting consumes significant energy in buildings, but current measurements of lighting efficiency are inadequate capturing the spatial and temporal effectiveness light. The most widely used measure, luminous efficacy, quantifies amount light generated by individual sources. While efficacy provides manufacturers designers with a useful metric for quantifying devices, it does not fully address use architectural spaces. Instead, application relationship between electrical power consumed...
The pupillary light reflex, which has been seen as an important noninvasive and objective indicator of autonomic nervous system function, can be used for evaluating the impact different lighting conditions in buildings on circadian behaviors, assessing ipRGC function healthy diseased retinas, explaining luminance adaptation. However, mechanism by intrinsic extrinsic signals ipRGCs regulate steady-state pupil size under continuous stimuli is still not clearly understood after decades...
Light that enters humans’ eyes and impacts circadian rhythms may come from various sources, including the sun, electric lighting systems, self-luminous displays. Occupants’ activities strongly impact light entering their eyes, which is difficult to predict not yet well understood. This study investigated contributions of different sources in real building environments better understand variables influence health occupants. Spectral irradiance distributions at a position equivalent front an...
To capitalise on the colour tuning capabilities of LED lighting, a model for converting device-specific control signals to chromaticity coordinates was used in psychophysical experiment evaluating usability three interfaces based RGB (red, green, blue), HSB (hue, saturation, brightness) and opponent mixing systems. Although common well accepted, interface had lowest both results subjective ratings. The not significantly different. These findings can guide development useful efficient tunable lighting
Lighting in the built environment has evolved since rapid uptake of solid-state lighting (SSL) devices [...]
Abstract Introduction Light therapy is a non-pharmacological intervention for circadian and sleep disorders. However, there limited evidence about the effect on electroencephalographic (EEG) in older individuals with disturbance. Methods Twelve participants (8 female; mean ± SD age, 65.6 8.7 years) self-reported poor completed two randomly allocated 72-hour in-laboratory visits separated by 2 weeks. The light condition consisted of blue-enriched (melanopic EDI=843.6 lux) during day...
Color-tunable lighting systems with inappropriate resolutions may confuse end-users and prevent them from easily specifying their desired colors. To improve the design of color-tunable systems, a psychophysical experiment explored independent interacting effects hue, saturation, luminance control on usability. Three criteria—efficiency, effectiveness, satisfaction—were used to evaluate these effects. Results showed that combinations middle-range hue resolution saturation facilitated greatest...
The performance of two approaches, a genetic algorithm and modified Monte Carlo method, for quickly optimizing spectra desired chromaticity, luminous flux circadian effect are compared when applied to 10-channel LED system.
A new approach to step-dimming leverages knowledge of the detectability and acceptability illuminance differences reduce lighting energy consumption. Computations show that this method can use more than continuous dimming.
Electric lighting plays a critical role in buildings, not only impacting the well-being, satisfaction, and performance of building occupants but also accounting for significant portion energy consumption. The commonly used efficiency metrics lighting, such as luminous efficacy or power density, fall short quantifying effective light architectural spaces. To address shortcomings existing measures, application that characterizes efficient delivery from source to target should be utilized....
Architectural lighting design education integrates educational practices from both and science. These can be challenging to reconcile, particularly since intuition is valued in conceptual change an important aspect of learning
Light entrains human circadian rhythms, but increased time spent indoors and decreased daylight exposure may disrupt regulation cause health problems. Much research is focused on improving indoor lighting conditions to minimize the adverse impact of electric lights, few studies investigate during incidental that people spend outdoors. For instance, when commute from home work, they are exposed daylight. The purpose this study daylight’s commuters’ rhythms. Measurements illuminance spectral...
Architectural lighting design education integrates educational practices from both and science. These can be challenging to reconcile, particularly since intuition is valued in conceptual change an important aspect of learning
An experiment was conducted to investigate the relationship between spatial separation and humans' ability detect illuminance differences. Results show that visual sensitivity differences increases as distance increases.
For spectrally tunable LED lighting, a model for converting device-specific control signals, such as DMX settings, to chromaticity coordinates was used in an experiment evaluating the usability of different colour interfaces.
A psychophysical experiment explored the independent and interacting effects of hue, saturation luminance control resolutions on usability color-tunable lighting systems. Three criteria were used to evaluate these effects.