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OCR: TABLE II CHARACTERISTICS OF SUPER-HIGH-PRESSURE MERCURY LAMP AND SODIUM LAMP Item Sodium Lamp Mercury Lamp Pressure (atmospheres) 200 Current density 280 Cross section cm 0.0075 Candles, em I0 Vapor tempera ture 280 8600 Light output (lumens (watt) Heller, Philips Techn. Rev., (1936) Mercury lamp: 1400 watts and water cooled 1.3 amperes 2 mm cross sec- tion Sodium lamp: 100 watts in 8 clear Dewar flask PRESSUR croae