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Semi-resonant begin fixtures are usually incompatible with energy saving T8 retrofit tubes, as a result of such tubes have a better starting voltage than T12 lamps and will not start reliably, especially in low temperatures. A number of manufacturers use constructive temperature coefficient (PTC) thermistors to disable instantaneous starting and provides a while to preheat the filaments. The semi-resonant start circuit was invented by Thorn Lighting for use with T12 fluorescent tubes.
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