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The adoption of energy efficiency measures in building codes places constraints on lighting designers that they fear will reduce the quality of the lit environment. This experiment was designed to test the hypothesis that lighting quality, as understood by lighting designers, affects the task performance, mood, comfort, health, and aesthetic judgements of(More)
Lighting practitioners and laypeople alike believe that the quality of the luminous environment can influence task performance, comfort, and well-being. There is mounting concern that the quality of the lit environment will decline in parallel to lighting energy use as energy codes and standards come into effect; however, there is no consensus about what(More)
The principal reason for introducing (and extending) daylight saving time (DST) was, and still is, projected energy savings, particularly for electric lighting. This paper presents a literature review concerning the effects of DST on energy use. Simple estimates suggest a reduction in national electricity use of around 0.5%, as a result of residential(More)
The energy use of an office building is likely to correlate with the number of occupants, and thus knowing occupancy levels should improve energy use forecasts. To gather data related to total building occupancy, wireless sensors were installed in a three-storey building in eastern Ontario, Canada comprising laboratories and 81 individual work spaces.(More)
This experiment was conducted in a mock-up office-space laboratory. One hundred and eighteen participants worked for a single day under one of four lighting designs. They had no control over the lighting until the latter half of the afternoon, when all participants were offered some form of individual dimming lighting control. During the working day(More)
Les renseignements dans ce document sont protégés par la Loi sur le droit d'auteur, par les lois, les politiques et les règlements du Canada et des accords internationaux. Ces dispositions permettent d'identifier la source de l'information et, dans certains cas, d'interdire la copie de documents sans permission écrite. Pour obtenir de plus amples(More)
Limited research comparing participant ratings of luminous environments to ratings of images of those environments indicates that images can be a reasonable surrogate for the real space, particularly on ratings related to aesthetics. However, the realism of such images when presented on computer screens is potentially limited by conventional display(More)
Detailed simulations of lighting and HVAC energy consumption were performed on a prototype office building in six North American climates. The goal of these simulations was to calculate the overall energy savings attributable to reductions in lighting power density (LPD) from 25.8 W/m 2 (past practice) to 17.2 W/m 2 (current code) to 8.6 W/m 2 (low).(More)
Thirty-nine participants viewed six interior scenes in an office/laboratory building and rated them for brightness, uniformity, pleasantness, and glare. The scenes were viewed in three presentation modes: participants saw the real space and images of the spaces on a 17-inch computer monitor in both conventional and high dynamic range (HDR) mode. HDR mode(More)