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A radiometer responds more strongly to shorter-wavelength light.
Red LEDs won’t spin a radiometer, white ones will a little, and blue ones will a lot.
You don’t need to listen to people hallucinate about virtual photons to understand this. If longer-wavelength light doesn’t even start turning the radiometer but shorter wavelengths do so immediately, then the same principle applies when light hits your body. These short wavelengths, shorter than nearly anything found in nature, exert more force against your retina.
The blue subpixels in your screen have a very short wavelength, ranging from 400 to 440 nm, placing them right at the cusp of UVA.
Subpixels don’t combine their wavelengths to create new ones. Instead, they project their original wavelengths at different intensities to create the illusion of other colors. This means your eyes are always exposed to these very short wavelengths whenever the blue subpixel contributes to the displayed color.
If you look at the extreme ends of light with IR and UV, you can see that IR penetrates far deeper and therefore has a much larger area to disperse its energy to. UV light doesn’t penetrate very deep at all and has a much smaller area to which it delivers its energy. That’s why short-wavelength light can kill cells and destroy DNA, while long-wavelength light cannot.
Edit:
A lot of LEDs are built from Blue LEDs
The first graph is from a regular White LED. Looking at that little infographic it makes sense why people find incandescent lights less straining on the eyes.
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