The sensations of brightness perceived in a living room with downlights were investigated by psychological experiment with eighteen observers. Three positions and four types of downlight reflector were examined. The method of magnitude estimation was adopted to measure the sensation of brightness. In addition, the luminance of areas related to the sensation of brightness were measured with a CCD camera. The relationships between these luminances and the sensation of brightness are discussed.The results showed that the sensations of brightness for a living room with downlights were strongly affected by ldquo;average luminance within the area of the front wallrdquo; and by ldquo;luminance in the corners of the roomrdquo;.
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