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[–] 1 point 1 month ago

Technically, every forward-biased rectifier emits EM of wavelength and intensity depending on materials.

1N4007 silicon rectifier emits a few THz photons when forward biased.

Use different materials and you have a LED, an inefficient rectifier but great light source.

Tube rectifier with high enough voltage

https://tubedata.jp/sheets/135/1/1DG3A.pdf

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