The role of automotive signaling lights is to enable each vehicle to correctly and rapidly inform the following vehicles and the pedestrians behind of its behavior. Regulations exist to set the minimum requirements concerning the performance and installation of signaling lights. Among such regulations are the ECE Regulations, U.S. FMVSS No.108, and Japanese Industrial Standards. All these regulations presume the use of incandescent bulbs and prescribe the required performance in terms of illuminance or luminous intensity values as measured at designated positions. However, LED have come to replace incandescent bulbs in some signaling lights due to the increased luminous flux capacity of LED. With their increasing luminance, the possibility of LED signaling lights glaring the following vehicles and the pedestrians behind is emerging as a new safety issue. To develop a quantitative glare evaluation method for LED signaling lights, the present experiment was conducted and relations were examined between the glare feeling assessment and measured luminance of LED signaling lights. Relations were also examined between glare feeling assessment and the existing discomfort glare index based on Westermann 's modified mathematical model that incorporates a factor of light emitting area. The results indicated a notably high correlation between glare feeling assessment points and discomfort glare index values. Consequently it was concluded that the discomfort glare index is an effective means of quantitatively evaluating the discomfort glare of LED signaling lights. As LED are expected to become brighter, the necessity will grow for harmonized evaluation of the glare by LED signaling lights and the above-mentioned mathematical model was found useful in determining discomfort glare threshold levels.
Examination of glare evaluation methods for LED signaling lights
Untersuchung von Blendungsbewertungsmethoden für LED-Signalisierungsleuchten
2003
8 Seiten, 2 Bilder, 2 Tabellen, 6 Quellen
Aufsatz (Konferenz)
Englisch
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