Illumination safety and class risks of LEDs according to EN 62471

IEC/EN 62471 gives guidance for evaluating the photobiological safety of lamps including incoherent broadband sources of optical radiation such as LEDs (but excluding lasers) in the wavelength range from 200 nm through 3000 nm. According to EN 62471 light sources are classified into risk groups according to their potential photobiological hazard.

Risk groups

Exempt No photobiological hazard
Group Ia
No photobiological hazard under normal behavioral limitations
Group II
Does not pose hazard due to aversion response to bright light or thermal discomfort
Group III
Hazardous even for momentary exposure

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