Discharge tube vapour pressure control circuit

Details Discharge tube vapour pressure control circuit Discharge tube vapour pressure control circuit

H - Electricity

05

B

315/41

H05B 41/14 (2006.01) H01J 61/28 (2006.01) H01J 61/92 (2006.01) H05B 41/19 (2006.01)

Patent

CA 1071696

PHN 7965 ABSTRACT: The invention relates to a device for operating a low-pressure sodium vapor discharge lamp without a stabilizing ballast. According to the invention the lamp is provided with a discharge tube having at least three main electrodes, whilst an automatically operating change-over switch occasionally switches the lamp current to another main electrode. By placing a reservoir with liquid sodium in a certain position near one of those main electrodes, the sodium vapor pressure in the dis- charge tube is kept up to the mark by the said switch-over action. - 18 -

248851

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