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Zoltán Lajos Bay (1900-1992)[1] was a Hungarian physicist, professor, and engineer who developed microwave technology, including tungsten lamps. He was the first person to observe radar echoes from the Moon. From 1930, he worked at the University of Szeged as a professor of theoretical physics.

In 1923 at Tungsram Ltd., a research laboratory was established for improving light sources, mainly electric bulbs.[1] The head of that laboratory was Ignácz Pfeiffer, whose research staff included Zoltán Bay, along with Tivadar Millner, Imre Bródy, György Szigeti, Ernő Winter, and many others.[1]

György Szigeti worked together with Zoltán Bay on metal-vapor lamps and fluorescent light sources. They received a U.S. patent on "Electroluminescent light sources" which were made of silicon carbide; these light sources were the ancestors of light-emitting diodes (LEDs).

Wiki This page was a Featured Article on April 18, 2009.

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