Title: Visual Ergonomic Assessments of LED Lighting & Display

Speaker: Dr. Yi-Chun Chen (陳怡君)
Associate Professor of the Department of Optics and Photonics, National Central University, Taiwan

Time: 2014/12/09 (Tuesday) 14:00-16:00
Venue: R101 Science Building 5, NCU (中央大學科五館 101 教室)

Abstract:
Light-emitting diodes (LEDs) are progressively applied in lighting and display due to their numerous advantages over the traditional light sources, such as small volume, long life time, high efficiency and no mercury pollution. In addition to cost reduction and energy saving, the development of LED lighting and display has moved forward to consider human factors, such as comfort, safety, health, and working performance. To assess the photobiological safety and visual ergonomic effects of LEDs, a series of studies are performed as follows. The photobiological safety of various lamps is classified according to the EN 62471:2008 standard. LED and fluorescent tubes are compared by psychophysical experiments for printed-text reading in an office environment. The results show no statistical differences between two lamp types in visual fatigue and visual comfort. The flicker glare and visual comfort of a multicolor LED billboard are investigated. Comfort rating models as functions of the flicker frequency and panel luminance are constructed by curve fitting the experimental data. The ranges of comfortable operating conditions are suggested based on the predictions of proposed models.