THE EFFECTS OF LENSED-INDIRECT AND PARABOLIC LIGHTING ON THE SATISFACTION, VISUAL HEALTH, AND PRODUCTIVITY OF OFFICE WORKERS. (1995, Ergonomics, 38, 260-280.)
Alan Hedge, William R. Sims Jr., and Franklin D. Becker
Department of Design and Environmental Analysis, NYS College of Human Ecology, Cornell University, MVR Hall, Ithaca, NY 14853-4401, U.S.A.
A pre-and post-renovation survey evaluated the reactions of office workers to two office lighting systems: a parabolic downlighting system and a ceiling suspended, lensed-indirect uplighting system. Questionnaire data on work content, perception of ambient environmental conditions (including office lighting), work-related health symptoms, job stress, job satisfaction, and self-reported productivity, and environmental data on illumination, air temperature, and relative humidity was collected. The lensed-indirect lighting system was more favorably rated on several subjective lighting impressions scales, and for computer work workers reported fewer screen glare problems, and fewer and less frequent problems with tired eyes and eye focusing. Productivity was less hindered by the lensed-indirect lighting, and satisfaction with office lighting and ratings of lighting quality were significantly higher for this system. These reactions were not associated with any differences in levels of illumination between the lighting systems. Ratings of lighting satisfaction and lighting importance were inversely related. Overall, some two-thirds of workers indicated a preference for working under the