this post was submitted on 26 Sep 2026
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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