An Improvement of the Built-in Starter for Metal Halide Lamps

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  • メタルハライドランプ用内蔵スタータの改良
  • メタル ハライド ランプヨウ ナイゾウ スタータ ノ カイリョウ

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Pulse starting of metal halide lamps requires the voltage between 1.0 to 1.5 kV.<BR>The starting voltage greatly depends on whether lamp starting is accompanied by the discharge between the main and the auxiliary electrodes or not.<BR>It is well known that, when a glow-starter is used as an ignitor and a current limiting resistance is in the range of 100 to 500 ohms, the pulse voltage lowers according as the resistance increases, while the pulse repetition rate slightly increases.<BR>However, in our experiments, when the current limiting resistance further increased and rose above 1.0 k ohms, the pulse repetition rate steeply increased, and reached about 500 times of the case of 300 ohms. Then, the breakdown voltage between the main and the auxiliary electrodes lowered.<BR>Therfore, it was proved that the starting characteristics of the lamps could be improved considerably although the pulse voltage lowered to the 600 to 700V level.

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