The sulfur lamp (also sulphur lamp) is a highly efficient full-spectrum electrodeless lighting system whose light is generated by sulfur plasma that has been excitedby microwave radiation. They are a particular type of plasma lamp, and one of the most modern. The technology was developed in the early 1990s, but, although it appeared initially to be very promising, sulfur lighting was a commercial failure by the late 1990s. Since 2005, lamps are again being manufactured for commercial use.
Sulfur lamp inside a faraday cage, which is necessary to prevent microwave radiation leakage from the magnetron which would cause radio interference and a loss of power in the lamp
https://en.wikipedia.org/wiki/Sulfur_lamp
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