Low wattage fluorescent lamp
AssigneeGeneral Electric Company
InventorsFeng Jin, Thomas F. Soules, David Kachmarick
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Abstract
A low-wattage mercury vapor discharge fluorescent lamp is provided for use with existing 110V high frequency electronic ballasts. The lamp has a discharge sustaining fill gas of mercury vapor and an inert gas that does not require a starting aid. The inert gas has 40-100 vol. % krypton, balance argon, and the fill gas has a total pressure of 0.5-3 torr. The phosphor layer has a coating weight of 2.3-4.3 mg/cm2.
Claims20
A low pressure mercury vapor discharge lamp comprising a light-transmissive glass envelope having an inner surface, a pair of spaced electrode structures, a phosphor layer coated adjacent said inner surface of said glass envelope, and a discharge-sustaining fill gas of mercury vapor and inert gas sealed inside said envelope, wherein said inert gas comprises 40-100 vol. % krypton, balance argon, and the total pressure of said fill gas inside said glass envelope is 0.5-3 torr at 25° C., said lamp having a lumen efficiency of at least 80 lumens/watt.
A low-wattage lighting system comprising a mercury vapor discharge fluorescent lamp and a ballast, said ballast being adapted to electrically couple to said lamp, said ballast comprising a striation killing electronic circuit and having a starting voltage of at least 500 volts, said lamp comprising a light-transmissive glass envelope having an inner surface, a pair of spaced electrodes, a phosphor layer coated adjacent said inner surface of said glass envelope, and a discharge-sustaining fill gas of mercury vapor and inert gas sealed inside said envelope, wherein said inert gas comprises 40-100 vol. % krypton, balance argon, and the total pressure of said fill gas inside said glass envelope is 0.5-3 torr at 25° C., said lamp having a lumen efficiency of at least 80 lumens/watt.
Dependencies are inferred from the claim text.