| Summary: | 碩士 === 國立臺灣科技大學 === 色彩與照明科技研究所 === 103 === In recent years, the technology of high-luminance light-emitting diode (LED) has a great breakthrough. LED has been used in lighting applications, but also widely ap-plied in traffic signs, so that the applications of LED light source can be carried for-ward. Nowadays, the standards of the LED traffic sign control in Taiwan is still not well-defined, the growing of LED lighting abuse may affect the passers-by, driving conditions, and light pollution at night. Therefore, this study had investigated in clar-ity and perception of glare with a LED embedded traffic mark by the data of psycho-physical experiment and proposed recommendations methods.
To obtain the main factors affecting the clarity in the preliminary experiment, control variables included the size of the LED light source, LED light source spacing and complexity and luminance with different fonts. The reference luminance specifi-cation of Illuminating Engineering Society of North America and Bureau of Energy, Ministry of Economic Affairs were followed in this research, so the luminance of LED light source is set to 20 ~ 500 cd/m2.
According to the preliminary results, the further discussion and comparison with LED embedded traffic mark used in the national highways was mentioned. Besides, by the evaluation of subjective feelings of clarity and perception of glare, we obtained the combination of different sizes and spacing of the LED light source. Thus, the lu-minance of single LED light source for LED embedded traffic mark was suggested to redefine as 100~300 cd/m2 according to the analysis results.
Finally, this study presents the related formula of evaluation score, and the for-mula is related with density and luminance. The definition of clear is as follow: if the clarity score is more than five points, then means observer felt clear, and likewise, when the score of perception of glare more than five points, it means observer has feeling glare. The conclusion can be used as a reference in LED signs in the future.
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