A. Blue LED The first visible spectrum LED was created […]
A. Blue LED
The first visible spectrum LED was created in 1962 and emits only very low intensity light. The first LED has been used in electronics for several years as a weak monochromatic source for indicator lights or warning lights. The blue diode was invented in the 1990s and has since been improved to make it useful for new and important applications, primarily for lighting, television and computer screens. The first batch of white LEDs gradually appeared on the market, especially for home lighting, which is now getting stronger and stronger. Light-emitting diodes are now commonly used as common light sources in various lighting systems: for example, traffic lights, portable lighting, automotive lights and home interior lighting.
B. The LED market is expanding rapidly due to low energy consumption. They are used in a wide range of applications in a wide range of applications, including the following examples:
Road signs: traffic lights, urban lighting, road and traffic safety (car lights), warning lights...
Lighting for homes and workplaces: flashlights and headlights, lighting fixtures, spotlights, decorative lighting (spotlights, arrays, decorative lights, etc.), operating room lighting and dental chairs...
Medical or cosmetic applications: llamps for phototherapy applications, medical or cosmetic treatments...
C. linsheng describes the health effects of lighting systems using LEDs
In October 2010, the French Food, Environmental and Occupational Health and Safety Agency (ANSES) released an expert assessment of the health of lighting systems using LEDs.
The main feature of commercially available light-emitting diodes is that the proportion of blue light emitted is high and has a very high brightness ("brightness"). In fact, blue light is part of the white light emitted by the sun, or a traditional light bulb made up of the colors of the rainbow. Then, due to the toxic effects of blue light and the risk of glare, the most interesting issue identified by the Agency relates to the eye.
D. Risk associated with Blu-ray
The blue light emitted by LEDs is very common. Therefore, the photochemical risk associated with blue light - therefore considered to be harmful and dangerous to the retina due to cellular oxidative stress - depends on the cumulative dose of exposure to that person. Three populations have been identified as particularly sensitive to or particularly exposed to blue light: children and aphakic (no lens), patients with certain eye conditions (eg age-related macular degeneration, ARMD) and specially exposed population LEDs ( Some categories of workers: install lighting systems, theater and film industry professionals...).
However, the European Biosafety Standard for Light Biosafety of Lamps (NF EN 62471, December 2008, defined by the International Commission on Illumination - International Electrotechnical Commission and International Electrotechnical Commission - IEC), applies to lamps and equipment using lamps Exposure limits are recommended for radiation from these sources. It considers all photobiohazards (thermal and photochemical hazards) that may affect the eye and defines four risk groups:
Risk group 0 (no risk). No risk.
Risk group 1 (low risk). Under normal conditions of use, there is no risk of exposure limitations.
Risk group 2 (medium risk). Reflections away from the bulb are sufficient to limit the risk.
Risk group 3 (high risk). This product may be at risk even if it is exposed for an instant or a short period of time.
Is the LED light harmful to your eyes?
No, for the general public, the light source does not exceed risk group 0 (no risk) or 1 (low risk). Quality Assurance provided by the TÜV Rheinland certificate, an internationally recognized reference laboratory.
E. Risk associated with glare
Two types of glare have been identified:
Discomfort glare due to differences in brightness and contrast of the fixture results in an instinctive desire to stay away from bright light sources or difficult to see tasks.
Disability glare reduces the contrast between the task and the glare source to a point where the task cannot be distinguished due to the mutual reflection of light within the eyeball and the brightness of the fixture. When the glare is so strong, the vision is completely impaired.
Therefore, for outdoor lighting with uncomfortable glare, the LED luminaire must comply with the European standard NF EN 12464-1 ("Workplace Lighting - Part 1: Indoor Workplace").