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Series switching of three fluorescent lamps with one ballast

IP.com Disclosure Number: IPCOM000019169D
Publication Date: 2003-Sep-03
Document File: 1 page(s) / 57K

Publishing Venue

The IP.com Prior Art Database

Abstract

ID612827-ID614335

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ID612827, ID614335

Series switching of three fluorescent lamps with one ballast

    It is well known to operate two fluorescent lamps in series making use of one ballast. Normally each of these lamps is equipped with its own starter. Provided that the lamp voltage is not too high, more than two (for instance three) fluorescent lamps can be operated in series with one single ballast. Again each of the lamps is equipped with its own starter. However, it becomes problematic to ignite these lamps since, in case of a mains voltage of approximately 230 V, the voltage over each lamp is comparatively small.

    It has been found that three fluorescent lamps, each equipped with its own starter, that are operated in series with a single ballast can be properly ignited making use of a modified low voltage starter. The low voltage starter is a starter suitable to be used in situations wherein the mains voltage is lower than 120 V for lamps with a lamp power up to 22 Watt. It is modified by increasing its filling pressure to 60 -90 torr.

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