High-pressure sodium discharge lamp

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

H - Electricity

01

J

313/7

H01J 61/12 (2006.01) H01J 61/82 (2006.01) H01J 61/88 (2006.01)

Patent

CA 1205118

ABSTRACT: High-pressure sodium discharge lamp. 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 170 103 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 ?i which satisfies i - 0,45 ? 2.35 ?i Le/e ? i + 0,45 where i is an integral positive number, c is the speed of sound in the gaseous part of the filling and Le is the effective length of the discharge vessel. According to the invention, the relation is satisfied : M?i ? fi ? d ? 185, in which M?i is the modulation depth of the power component having a frequency ?i, fi 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. Fig. 5

427541

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