THE APPROPRIATE ILLUMINANCE COMBINATIONS OF A LED DESK LAMP AND AMBIENT LIGHTING BASED ON VISUAL COMFORT

摘要

An experimental procedure was developedrnto evaluate visual comfort when readingrnunder various illuminance combinationsrnprovided by a LED desk lamp and ambientrnlighting. Three central illuminance levelsrn(1000, 1500, and 2000 lux) and four contrastrnratios between the central and ambientrnilluminance (1:0, 4:1, 3:1, and 2:1) wererntested. 36 subjects aged 18-25 years oldrnparticipated in this study. The resultsrnshowed that visual comfort was not affectedrnby the central illuminance designed in thisrnexperiment but depended on the illuminationrncontrast. We concluded that when therncentral illuminance has reached a sufficientrnlevel for reading, it is more important to findrnan appropriate lighting contrast for visualrncomfort. The comfortable contrasts found inrnthis research can be a reference for therndesk-lamp and interior lighting designers.