Arc discharge lamp with elongated outer envelope orthogonal to l

Details Arc discharge lamp with elongated outer envelope orthogonal to l Arc discharge lamp with elongated outer envelope orthogonal to l

1987-10-26

1989-07-11

Wieder, Kenneth

Electric lamp and discharge devices

With temperature modifier

Double wall, jacket or casing for envelope

313634, 313318, H01J 6132, H01J 6134

Patent

active

048475300

ABSTRACT:
An arc discharge lamp having an elongated outer envelope being orthogonal or transverse to the central axis of the lamp base. The invention provides an optically precise, extremely rugged, very efficient, and long-lived light source particularly well suited for use in rotating navigational signals which are for use in rotating navigational signals which are frequently situated in remote locations and exposed to all types of weather conditions. In a preferred embodiment of the invention, the lamp comprises a base having a vertical central axis, a light-transmissive outer envelope elongated along a horizontal central axis, and an upwardly arched arc tube for horizontal operation mounted within the outer envelope. In comparison with filamented counterparts of equal wattage from the prior art, the arc discharge source provides greater luminous efficacy and lamp life. When a lamp in accordance with the invention is selected to match the observable range and flash period of an existing beacon, the operating power of the arc source is substantially reduced in comparison with the presently employed filamented source. A lamp in accordance with the invention may be retrofitted into existing navigational beacons; it may be powered from solar sources; and its use results in substantially reduced maintenance costs.

REFERENCES:
patent: 2152989 (1939-04-01), Ewest et al.
patent: 2164183 (1939-06-01), Van Liempt et al.

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