Abstract
An experiment was performed to investigate the influence of sparkling luminous elements on overall brightness impressions. Evaluations of overall brightness impressions were carried out under various lighting conditions in which the luminance, size, shape and background luminance of the luminous element were varied. Subjective appraisals of the impression (sparkling, glaring or merely bright) of luminous elements were also carried out. The results suggested that the overall brightness impression of a room with a sparkling luminous element is often about 1.2-1.3 times higher than that without a luminous element The optimum lighting conditions that increased the overall brightness impression were elucidated.
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