HIGH PRESSURE SODIUM VAPOUR LAMPS with a polycrystalline translucent aluminum oxide discharge tube enclosed in an ovoid or tubular outer glass envelope. The ovoid shell of the SON-LAMP is internally coated with aluminum oxide powder. The discharge tube contains an amalgam of mercury and sodium along with xenon gas as starting aid. The outer shell is evacuated and a getter maintains this high degree of vacuum throughout the lamp life.
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Lamps, High Pressure Sodium Vapour