A Guide to Methodology Procedures for Measuring Subjective Impressions in Lighting

Flynn, John E.; Hendrick, Clyde; Spencer, Terry J.; Martyniuk, Osyp

doi:10.1080/00994480.1979.10748577

“…This was assessed using a set of 27 semantic differentials based on wellknown lighting research [Flynn et al 1979;Loe et al 1994].…”

Section: Simulated Office Tasks and Questionnairesmentioning

confidence: 99%

Task lighting effects on office worker satisfaction and performance, and energy efficiency

Newsham¹

2005

LEUKOS

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1582/LEUKOS.2004.01.04.001 Leukos, 1, 4, pp. 7-26, 2005-04-01 Task lighting effects on office worker satisfaction and performance, and energy efficiency Newsham, G. R.; Arsenault, C. D.; Veitch, J. A.; Tosco, A. M.; Duval, C. L. ABSTRACTThis paper reports on two experiments conducted in the same office laboratory. As part of a larger experiment, 58 participants worked for a day under one of two lighting designs. The first design used ceiling-recessed parabolic luminaires only; the second design employed the same parabolic ambient lighting, with the addition of an angle-arm task light. Participants had no control over the lighting until the afternoon, when they were offered dimming control over the ambient parabolic lighting; participants with task lighting were also permitted to move the arm location. During the day participants performed a variety of simulated office tasks, as well as completing a number of questionnaires on mood, satisfaction, and discomfort. There was no main effect of lighting design on questionnaire outcomes, however, task lighting was associated with performance improvements on some tasks. Interestingly, provision of a task light did not lower participants' preferred ambient light output.The second experiment, with 31 participants, followed up on this final point. Again, ambient lighting was provided by ceiling-recessed, parabolic luminaires, and participants were provided with a task light. For two task light types (angle-arm and luminous shade) at three different levels of output (0%, 50%, and 95%), participants used a dimmer to select their preferred level of ambient lighting. Increasing task lighting did reduce chosen ambient light output, but the reduction in lighting power was small, and only about the same as the power drawn by the task light. Results suggested that participants did not dim ambient lighting further because they preferred to maintain illumination on non-task surfaces, and to avoid extreme luminance ratios.

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“…If occupant ratings of luminous environments, particularly ratings of attractiveness, could be reliably correlated with photometric descriptors that are easily calculated prior to a space's construction, this would be a major step forward for lighting design. Unfortunately, this has proven difficult, though some progress has been made 15,19,22,23 .…”

Section: Do Subjective Ratings Correlate With Photometric Descriptors?mentioning

confidence: 99%

Preferred Surface Luminances in Offices, by Evolution

Newsham

¹

,

Marchand

²

,

Veitch

³

2004

Journal of the Illuminating Engineering Society

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Society, 33, 1, pp. 14-29, 2004-02-01 Preferred surface luminances in offices, by evolution Newsham, G. R.; Marchand, R. G.; Veitch, J. A. office, and rated them for attractiveness. The image was projected onto a screen at realistic luminances and 54% of full size. The images in the series were geometrically identical, but the luminances of important surfaces were independently manipulated. Initially, the combinations of luminances were random, but as the session continued a genetic algorithm was used to generate new images that generally retained features of prior images that were rated most highly. As a result, the images presented converged on an individual's preferred combination of luminances. The results demonstrated that this technique was effective in reaching a participant's preferred combination of luminances. There were significant differences in room appearance ratings of the most attractive image compared to other images, and the differences were in the expected direction. Factor analysis of ratings of the most attractive images revealed a factor structure with some similarity to that obtained when people rated real office spaces. Furthermore, preferred luminances were similar to those chosen by people in real settings, as was the variation in preferences between individuals. Journal of the Illuminating EngineeringFinally, subjective ratings of brightness, uniformity and attractiveness were significantly related to luminances in the image.

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“…Judgements about the aesthetic appearance of the room were assessed using 27 semantic differential pairs (Table 16) adapted from previous research to make them appropriate to this study. 9,21 Participants were instructed to base their responses on their opinions of the appearance of the room. We judged that an instruction to focus on the lighting alone would be meaningless to these naive participants; moreover, we wished to avoid creating response biases.…”

mentioning

confidence: 99%

Lighting Quality and Energy-Efficiency Effects on Task Performance, Mood, Health, Satisfaction, and Comfort

Veitch

¹

,

Newsham

²

1998

Journal of the Illuminating Engineering Society

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Society, 27, 1, pp. 107-129, 1998 Lighting quality and energy-efficiency effects on task performance, mood, health, satisfaction and comfort Veitch, J. A.; Newsham, G. R. Lighting Quality and Energy-Efficiency IESNA 1997 Conference, Paper # 47 2 Abstract 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 office workers. Nine lighting systems were installed in a windowless, 83 m 2 (880 ft 2 ), open-plan office space containing six workstations. The designs combined three levels of lighting power density (LPD) and three levels of Designers' Lighting Quality (DLQ) (recessed troffers with prismatic lenses; recessed troffers with parabolic louvers; indirect or direct/indirect fixtures). In the low LPD options, the ambient lighting systems were supplemented with task lighting. Temporary office workers (292 in total) each worked for one day under one of the nine lighting conditions. In addition to morning and afternoon visual performance tests, they performed a variety of computer-based and paper-based tasks designed to be representative of modern office work, and completed questionnaires to assess satisfaction and impressions of lighting quality, mood, physical comfort, and social behaviours. The results show that energy-efficient lighting and good-quality lighting can be compatible. For computer-based work, under existing lighting power density limits, parabolic-louvered luminaires provide better verbal-intellectual and clerical task performance than recessed lensed luminaires. Verbal-intellectual task performance and visual performance were better under electronic ballasts than magnetic ballasts, regardless of lighting system. Résumé L'adoption de mesures de rendement énergétique dans les codes du bâtiment impose des contraintes aux éclairagistes qui, selon eux, risquent de réduire la qualité du milieu éclairé. On a conçu cette expérience dans le but de vérifier l'hypothèse selon laquelle la qualité de l'éclairage, comme l'entendent les éclairagistes, influe sur l'exécution des tâches, l'humeur, le confort, la santé et les jugements esthétiques des employés de bureau. Neuf systèmes d'éclairage ont été installés dans un bureau...

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A Guide to Methodology Procedures for Measuring Subjective Impressions in Lighting

Cited by 127 publications

References 6 publications

Task lighting effects on office worker satisfaction and performance, and energy efficiency

Task lighting effects on office worker satisfaction and performance, and energy efficiency

Preferred Surface Luminances in Offices, by Evolution

Lighting Quality and Energy-Efficiency Effects on Task Performance, Mood, Health, Satisfaction, and Comfort

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