A single-crystal sapphire material manu- factured by Corning for arc tubes in high pressure sodium vapor lamps in- creases luminous efficacy of such lamps by as much as 5 to 10 percent. The improved efficiency of the new Corstar sapphire arc tube over conven- tional polycrystalline arc tubes is a result of the mono-crystalline material`s extreme purity and increased trans- parency.
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