Bought LEDs in every wavelength under $80 to reveal how eyes differ from phone cameras
johnowhitaker · x · 2026-09-12
johnowhitaker bought LEDs in nearly every wavelength he could find — most under a dollar, a few oddly priced at $80 each. The cheap trick makes it easy to see how differently your eyes and a phone camera perceive various wavelengths, like IR and UV that cameras sense but humans can't.
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