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Metal halide arc discharge lamp having short arc lengthA metal halide arc discharge lamp includes a sealed light-transmissive outer jacket, a light-transmissive shroud located within the outer jacket and an arc tube assembly located within the shroud. The arc tube assembly includes an arc tube, electrodes mounted within the arc tube and a fill material for supporting an arc discharge. The electrodes have a spacing such that an electric field in a range of about 60 to 95 volts per centimeter is established between the electrodes. The diameter of the arc tube and the spacing of the electrodes are selected to provide an arc having an arc diameter to arc length ratio in a range of about 1.6 to 1.8. The fill material includes mercury, sodium iodide, scandium tri-iodide and a rare gas, and may include lithium iodide. The lamp exhibits a high color rendering index, high lumen output and high color temperature.
Document ID
20080012413
Acquisition Source
Johnson Space Center
Document Type
Other - Patent
Authors
Muzeroll, Martin E.
Date Acquired
August 24, 2013
Publication Date
August 2, 1994
Subject Category
Electronics And Electrical Engineering
Funding Number(s)
CONTRACT_GRANT: NAS9-18200
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-5,334,906
Patent Application
US-PATENT-APPL-SN-965490

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