Blue-Light Hazard and LEDs: Fact or Fiction?

Blue-Light Hazard and LEDs: Fact or Fiction?
01 Jan 2021 / by admin in Light

There is no certainty regarding the health risks of long-term LED exposures, but a renewed interest in testing has been created by the prevalence of phosphor-coated White LEDs in daily applications. Latest research has concentrated on the spike in the blue shortwave area of the spectral power distributions LEDs (SPDs). Exposure to everything from circadian disruption to blue light hazards was linked to studies in disciplines outside lighting. The latter article will focus on these. However, can the general public be alarmed? The lighting experts claim not, necessarily.

The Blue Light Risks


In the 1970s, the bluelight risk was described as anticipating the development of white LEDs in the area of occupational health and safety. “Starring at an intense light source,” says David Sliney, Chair of the IES Photobiology Commission, who explains the acute photochemical harm to the retina. The radiation absorbed from the retina releases many chemical reactions and, within one or two days of exposure to the retinal inflammation, cell death and white injuries.

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Age-related macular degeneration (AMD), the leading cause of vision deterioration in people over 65, has often induced photochemical harm from blue light exposure. Biomedical Why so blue? Why so blue?

Typical white LEDs

Typical white LEDs are gallium nitride (GaN) and blue dye with a phosphorus cover which transforms the blue light into white for others. This white phosphorous LEDs can be produced with custom spectral profiles, but a blue energy spike is required. The phosphors create a second, wider peak between 550 and 650 nanometers, in some cases higher. believe that long-term exposure to blue light may induce oxidative stress on retinal cell structures, contributing to the accumulation of lipofuscin, an AMD-attributable, lipid-containing waste substance.

There have also been questions regarding the brightness of LEDs. The diodes emit a directed directional light as a point source which may be unwanted to specifically see. Yet the performance of the DOE is less than the chance of blue light: a luminance greater than 4 giga candela per square metre and illumination greater than 400,000 lux. In addition, the origins are also diffused and reduce pain in internal lighting applications.


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