Analysis of light radiation safety standard for LED automotive headlights

1 Introduction, radiation hazards have been recognized by the World Health Organization (WHO) It is clearly one of the four major environmental safety problems faced by human beings alongside water, air and noise. Optical radiation is an important component of radiation and is also a radiation band that is in close contact with human beings. The light radiation safety problem studied in the field of light source and lighting is mainly the damage of optical radiation to human body. The harm of light radiation includes the damage of ultraviolet light, visible light and infrared radiation to human tissues. The general research objects are mainly human eyes and skin. The eye is one of the important sensory organs of human beings. Its structure is very complex, its self-repairing ability is weak, and it is vulnerable to optical radiation damage, for example, too strong blue light is easy to cause photochemical damage of photoreceptor cells on retina, and too strong thermal radiation can cause thermal damage of retina, etc. The corresponding relationship between optical radiation band and eye action area is shown in Fig. 1. In recent years, the international photobiology research has developed rapidly, especially after 2002, through the research on the third non-visual cell of human beings, the basic research on the influence of light radiation on circadian rhythm and endocrine system, etc, people pay more attention to the use of light sources and potential problems. At present, several major diseases caused by light radiation hazards are known: photoinduced keratitis and photoinduced conjunctivitis, cataract, retinal burns, retinal blue light hazards, skin sunburn, ultraviolet erythema, skin aging, skin cancer, etc. Status quo of light radiation safety standardization for 2LED automotive headlights 2. 1LED International Research Institute on optical radiation safety (1)International Commission on Non-Ionizing Radiation Protection (ICNIRP) ICNIRP provides recommended exposure limits based on evaluation of biophysical data, and publishes guidelines for photoradiation safety of incoherent light sources and laser beams. For LEDs, ICNIRP recommends following the guidelines for incoherent light sources. (2)International Lighting Committee (CIE) The sixth division of CIE has set up a corresponding technical committee to study the evaluation of LED light radiation on human eyes. In 2002, CIES009, a light biosafety standard for incoherent light sources such as LED, was issued and recommended to IEC as an industry standard. (3)International Electrotechnical Commission (IEC) Since 1993, the light radiation safety requirements of LED products have been incorporated into IEC60825 'safety of laser products' and standardized according to the requirements of laser products. However, LED is different from laser, so IEC60825-released in 2007- 1 The laser product of Security 1st part Equipment Classification and requirements of the second edition in LED products no longer in accordance with the laser product to consider. At the IEC/TC76 meeting held in October 2008, it was officially decided to include all the light radiation safety of LED products in the scope of non-laser product standard IEC62471 'light and biological safety of lamp and lamp systems. In recent years, IEC/TC76 has accelerated the standardization of light biosafety. The research and standardization of LED light Biosafety has become a hot topic in CIE and IEC, relevant light biosafety standards have also been promulgated. In June 2012, IEC issued IEC/TR62778 'application of blue light to the hazard assessment of light source and lamps and lanterns in IEC62471' as a guide to the evaluation of blue light hazards of light source and lamps and lanterns, it has important guiding significance for blue light evaluation of light sources and lamps.