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US4973878A
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Filament structure and method of making such structure
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US4781641A
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Tool for making three-way lamp bases
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US4787865A
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Three-way lamp bases and method for making them
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US4774431A
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Arc tube wire support
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US4708679A
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Method of making support means for discharge lamp tubes
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US4701673A
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Ballast adaptor for improving operation of fluorescent lamps
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US4748368A
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Three way gas discharge lamp
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US4629939A
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Discharge lamp with automatic shut off
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US4602956A
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Cermet composites, process for producing them and arc tube incorporating them
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US4525650A
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Starting and operating method and apparatus for discharge lamps
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US4631450A
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Ballast adaptor for improving operation of fluorescent lamps
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US4500810A
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Fluorescent lamp having integral light-filtering means and starting aid
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US4538091A
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High-pressure sodium lamp spring clip cross piece for electrode and end plug support
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US4516446A
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Precision rotating rod guide
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US4506195A
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Apparatus for operating HID lamp at high frequency with high power factor and for providing standby lighting
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US4463277A
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Compact halogen-cycle incandescent lamp, and lamp unit utilizing such lamp as a light source
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US4475065A
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Method of operating HID sodium lamp to minimize lamp voltage variation throughout lamp life
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US4479074A
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High intensity vapor discharge lamp with sintering aids for electrode emission materials
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US4501992A
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Energy conserving instant-start series-sequence fluorescent lamp system and fluorescent lamp with overcurrent protection
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US4503360A
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Compact fluorescent lamp unit having segregated air-cooling means
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