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The European Union Directive 2006/25/EC lays down the minimum safety requirements regarding the exposure of workers to risks arising from artificial optical radiation, including ultra-violet radiation (UVR). It places a responsibility on employers to assess exposure levels, adopt preventative...
A provisional model of brightness perception for illuminated outdoor scenes was recently proposed based upon a combination of photopic and short-wavelength cone spectral sensitivities, where short-wavelength cone sensitivity increases with radiance. An experiment was undertaken to determine...
This paper reports on experimental work carried out to test metrics for predicting spatial brightness at mesopic levels under lamps of different spectral power distribution. The side-by-side matching technique was used following an extensive review of experimental design. Five different types of...
This paper presents an energy-efficient lighting control system for open-plan offices with two novel features: A versatile ‘plug-and-play’ wireless-networked sensing and actuation system, and a control method incorporating multiple management strategies to provide occupant-specific lighting....
Light emitting diode (LED)-based systems are considered to be the future of lighting. We consider the problem of energy-efficient illumination control of such systems. Energy-efficient system design is based on two aspects: localised information on occupancy and optimisation of dimming levels of...
A field study was conducted with eighth-grade students to determine the impact of morning light on circadian timing, sleep duration and performance. Before and during school hours for a week in February 2009, half the students studied wore orange glasses that minimised the short-wavelength light...
An increased illuminance at the workplace is often said to be linked to an increase in productivity. We investigated this relationship in 23 workers on a production line in a car factory. Measurements of visual performance (visual acuity, colour vision and contrast sensitivity), a physiological...
Laboratory tests were carried out to investigate lighting for pedestrians at mesopic levels under lamps of different spectral power distribution. This paper reports an evaluation of lamp spectrum effects on visual acuity, using Landolt ring charts of high and low luminance contrast, and forced...
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