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Product Code: ILSC2011_1201

Blue Light Hazard Evaluation Based On The Luminance Of Light Sources
Jian Zheng, Zhejiang University; Hangzhou Peoples Republic of China
Junkai Li, SENSING Instruments Co., Ltd; Hangzhou Peoples Republic of China
Mou Tongsheng, Zhejiang University; Hangzhou Peoples Republic of China
Presented at ILSC 2011

Blue Light takes various effects in the human vision. Several physical parameters, as luminance, chromaticity, circadian radiance and weighted radiance of retinal photochemical damage could be quantitative. In the safety standard IEC62471, the threshold of the retinal blue light hazard and the assessment methods of the weighted radiance were specified, but it is necessary for the measurement by using professional equipments.
In the IEC-CTL decision regarding on photobiological safety of LED luminaires, it comes to a conclusion that further hazard risk classification isnt needed for LED luminaires with the luminance less than 10000cd/m2. It has been evaluated for general lighting sources in the article, especially for LED Lightings. By viewing the results, color temperature CCT, strictly speaking, spectral distribution has great correlative to the conclusion. Besides, traditionally in the definition of Luminance there are not specifications of viewing geometry to the apparent sources. There is no problem for the uniform emitting surface such as fluorescent lamps. However, the situation will be in the challenge for LED and HID lighting sources.
In the paper, comparing the differences of the results measured by the commercial luminance meter, a simple measuring method was proposed for the photobiological safety evaluation, to consider the factors as field of view (FOV) and the aperture of the measurement.

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