A high pressure sodium lamp with an improved starting circuit

Abstract

The authors previously introduced a High Pressure Sodium Lamp with increased xenon pressure to achieve higher efficacy and to enable the use on High Pressure Mercury Ballast by means of an internal starter as well²⁾. In this paper, firstly, the relationship between the pulse voltage of the internal starter and the lamp starting ability is discussed. The authors then introduced an improved starting method by adding a simple circuit which aims to lower the maximum pulse voltage.