Road vehicles' signalling lamps must comply with the requirements of relevant UN ECE regulations. Photometric performance which plays main role in the per-ception of signals is given in the form of luminous intensity distribution grids. An assumption was made, that light being in conformity with the above mentioned requirements is clearly visible and spontaneously recognizable, independently of observation conditions and shape or dimensions of light emitting surface. Modern design methods and application of LED light sources enabled construc-tion of signalling lamps being very well adjusted to vehicle body. Proper luminous intensity distribution is obtained by adequate shaping of reflector and applica-tion of lens in the form of smooth profile. Such constructions, in spite of being in conformity with the luminous intensity requirements, may cause observation discomfort, when compared to traditional designs (e.g. because of direct light source observation). In normal conditions, eye reacts to the contrast of luminance between the lamp lens and the surrounding environment. Based on the light dis-tributions of lamps, measured with matrix luminance meter, the paper authors obtained the luminance contrast's values of chosen vehicles lamps in different ambient conditions. Theoretically estimated values of the contrast were compa-red with the measurement results obtained. Measurements enabled the evalua-tion of the glare caused by lamps operation of different construction and shape. Based on the research conducted, the parameters of signalling lamps (contrast, luminance, shape and dimensions of light emitting surface) have been proposed, which ensure optimal comfort of light signals' perception.
Optimal luminance contrast of vehicle signalling lamps
Optimaler Leuchtdichtekontrast von Fahrzeugsignallampen
2009
12 Seiten, 10 Bilder, 1 Tabelle, 8 Quellen
Conference paper
English
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