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.
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