High-pressure sodium discharge lamp

Details High-pressure sodium discharge lamp High-pressure sodium discharge lamp

1983-05-02

1985-07-02

Demeo, Palmer

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

313631, 313634, 313638, H01J 6122, H01J 6130, H01J 61073, H01J 4124

Patent

active

045270970

ABSTRACT:
The invention relates to a high-pressure sodium lamp provided with an elongate discharge vessel in which the pressure P in the operative condition of the lamp is at least 170.times.10.sup.3 Pa. The lamp is suitable to be operated with a power of periodically alternating value, which power comprises at least one component having a frequency .nu..sub.i which satisfies i-0.45.ltoreq.2.35.nu..sub.i Le/e.ltoreq.i+0.45 where i is an integral positive number, c is the speed of sound in the gaseous part of the filling and L.sub.e is the effective length of the discharge vessel. According to the invention, the relation is satisfied: M.nu..sub.i .multidot.f.sub.i .multidot.P.multidot.d .ltoreq.185, in which M.nu..sub.i is the modulation depth of the power component having a frequency .nu..sub.i, f.sub.i is a geometric lamp factor and d the average inner diameter of the discharge vessel. In this manner, the operation of the lamp is free of arc instabilities due to longitudinal acoustic resonances.

REFERENCES:
patent: 4052636 (1977-10-01), Strok
patent: 4109175 (1978-08-01), Watarai et al.

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