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IR is electromagnetic radiation with longer wavelengths than those of visible light at 0.74 micrometres (µm) to 300 µm, which is extends the nominal red edge of the visible spectrum.

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Not specific to LEDs, but yes you can generate iR without visible light. Part of the problem with that is that filters designed purposefully to block out visible light can be pricey and require a hig …
answered Aug 3 '17 by Jesse Williams