Official response! International Lighting Commission position statement on Blue-Light hazards
2019年3月 March 2019 Source: China Lighting Society, Journal of Lighting Engineering
Many media reports claim that the use of light sources such as light-emitting diodes (LEDs) can cause harm to human health. These hazards are generally referred to as “blue light hazard (BLH)”, which refers to the actual risk of eye damage and its impact on general health.
The term “blue light hazard” is used only in consideration of the photochemical risk of the retinal tissue of the eye (technically referred to as “spot lesion”) and is generally associated with bright light sources such as glare or welding arcs. The term includes “blue light” because the risk of photochemical damage depends on the wavelength and peaks in the blue band of the spectrum at 435 nm to 440 nm. The International Commission on Non-Ionizing Radiation Protection (ICNIRP) issued the “Blue Light Hazard Function” and specified wavelength-dependent weighting functions and guiding exposure limits . This function has been standardized by CIE and is part of CIE S 009:2002 “Photobiosafety of Lamps and Lamp Systems” and is now published as IEC/CIE 62471:2006 . There is no evidence that human exposure to light exposure within limits will have any adverse health effects.
White light fixtures such as LEDs usually contain light associated with blue light hazards. A “cold light” lamp or a high color temperature lamp may contain more blue light components than a “warm light” or low color temperature lamp. Among the incandescent lamps and LED lamps in conventional lighting, the exposure limit of the blue light hazard of the lamps of the same color temperature is the same. Practical evaluations show that the luminaire does not exceed the exposure limit of the blue light hazard under reasonable and foreseeable conditions of use. In addition, the degree of exposure of such lamps to blue light is often lower than when viewing the blue sky.
It is very important to consider the degree of exposure of the human eye in the actual situation . A large number of research and media reports have claimed that white light sources have an adverse effect on human eye health. Most of these studies are based on unconventional states, including:
High color temperature LED light (very blue light component)
Exposure significantly beyond the limits of the ICNIRP exposure
Gaze light source
Use night action models or human ex vivo cells
When the white light source emits blue light close to the blue light hazard exposure limit dose, the light emitted will be very bright, which produces an unpleasant glare. Gazing at such a light source can be considered an abnormal behavior. In addition, high color temperature illumination is unpleasant and uncomfortable for most people, especially as home lighting. For people with normal behavior, there is a large amount of time per day for temporary exposure to high doses of light. However, the accumulation of these exposures during the day does not exceed the exposure limit.
Although CIE believes that “blue light hazard” is not a problem for white light sources used in general illumination or even light sources rich in blue light components, caution is also recommended for multiple days of continuous exposure to light radiation near the exposure limit of blue light hazards. In fact, this exposure should be avoided. This exposure is unlikely for white light sources, but is possible for light sources that primarily emit blue light.
It should also be recognized that the use of a light source that primarily emits blue light causes the exposure of the child’s eyes to also cause concern. Although not exceeding the blue light exposure limit, such light sources are too bright for children to cause them to feel dizzy. Therefore, it is not recommended to use the blue indicator light for toys and other equipment that children may see. If blue light is the primary source in such products, the blue exposure limit should be reduced by one-tenth. This is especially important for light sources that emit purple and deep purple light.
There is a literature that blue light exposure may be associated with the risk of age-related macular degeneration. This statement is currently speculative and has not been supported by peer review.
The term “blue light hazard” should not be used when referring to circadian rhythm disorders or sleep disorders. However, CIE is aware of public concerns about the non-visual impact of Blu-ray on human health and has issued a position statement on this, and will consider updating the statement at the appropriate time, such as CIE S 026:2018[ 5].