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Retinal Blue-Light Hazard (IEC/EN 62471)
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Blue light also has another biological effect on the eyes. The details are illustrated in the standard IEC/EN
62471 (Photobiological safety of lamps and lamp systems). The Retinal Blue-Light Hazard stated in IEC/EN
62471 is related to the Photoretinitis, i.e., photochemical retinal hazard caused by high-energy incident light
to instigate damage in the retina. Its quantifying parameter is LB (Retinal Blue Light Radiance). Higher
risk group stipulated in IEC/EN 62471 specifies higher LB values.
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| Lower Retinal Blue Light Radiance |
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LB (Retinal Blue Light Radiance) depends on Lλ (spectral radiance) and Bλ (blue light hazard sensitivity) at each wavelength. Bλ
curve (shown on the right) rises sharply from 400 nm and peaks at 435 nm and 440 nm. After
that, Bλ gradually declines to negligible value at 550 nm.
Bλ curve demonstrates that the blue-turquoise light will generate lower LB than the blue-violet light at same spectral
power. Because of this, blue-turquoise light is less sensitive to Photoretinitis than blue-violet light.
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LiteBlue LED emits about 10% of blue-violet light within the blue light content, thus substantially lowering
the LB value and reducing the risk of Retinal Blue Light Hazard. Compared with the standard LED of 450 nm
blue pump, LiteBlue LED can lower the LB value by about 20%.
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| Lower apoptosis of Blue-turquoise light vs Blue-violet light |
Paris Eye Institute and Essilor conducted a laboratory experiment to investigate the impact of blue
wavelength on macular degeneration (measured by apoptosis, or cell death), which is one of the major causes
leading to AMD (Age-Related Macular Degeneration). The experiment results were shown in the below graph, which
suggests that blue-turquoise light causes lower apoptosis by about 2 times than the blue-violet
light. If some people having lower macular cell repair capability are exposed to high intensity
light, blue-turquoise light might be less susceptible than blue-violet light. Ongoing researches
are being conducted to study more about this subject.
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