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Quad-Tube Lamp
Single-ended compact fluorescent lamp consisting of two twin tubes on a single base.Quartz Lamp
Or quartz halogen. Term derives from the quartz glass that encloses the filament and halogen gas. Quartz glass can withstand the high pressure of the halogen lamp, but it transmits more UV radiation than ordinary hard glass. Touching the quartz glass with bare hands leaves an oily residue that greatly reduces lamp life.
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