| Definition: | maximum level of exposure of a surface, usually the eye or skin, that is not expected to result in adverse biological effects Note 1 to entry: Exposure limits for human safety of optical radiation, HL, are normally recommended by the International Commission on Non-Ionizing Radiation Protection (ICNIRP). Note 2 to entry: Exposure limits are often based on irradiance (e.g. for the skin), but where relevant, can also be based on radiance (e.g. the blue light hazard of extended sources).
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