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发表于 2016-8-11 13:16
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咨询了几家机构，大部分都是说500lx，不过IEC 62471-2中有描述，单独LED因不确定最终是否用于照明，建议在200mm距离下测量:' E L J( R& u+ x
Although IEC 62471 is primarily a horizontal standard, it provides application-related requirements. Specifically, sources that are exclusively used for general lighting service (GLS) should not be assessed by application of the worst case measurement distance of 200 mm, as is to be applied to all other sources. In these cases, "…the hazard values shall be reported as either irradiance or radiance values at a distance which produces an illuminance of 500 lux…For all other light sources or lamp systems, including pulsed lamp sources, the hazard values shall be reported at a distance of 200 mm…“ (500 lux is a typical minimum visual task lighting level in offices or at workshop benches). However, in many cases a lamp manufacturer may not know whether a specific lamp will be used for general lighting purposes and the categorisation of single lamps or LEDs should be performed at a distance of 200 mm. The 500 lux requirement is mainly related to the final luminaire. Additionally, the application of this requirement to single lamp is usually not meaningful, since lamps will be combined with other lamps (e.g. in an array) or attached to beam-shaping optics, etc. Thus, the required illuminance measurement of the final GLS-source takes into account contributions of the whole luminaire. Unlike the measurements for risk group classification, the acceptance angle for the illuminance measurement of GLS-sources should not be limited. % O; I, i7 L% X$ I, v3 U' E
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