Energy balance of a high-pressure sodium arc tube

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概要

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• This paper describes in detail the dependence of the energy balance of a high-pressure sodium arc tube on discharge parameters. The total radiation and the thermal conduction loss of the arc tube were estimated by calculating the thermal dissipation loss from the measured wall temperature of the tube envelope. The results thus estimated showed a reasonable consistency with experimental data on the absolute visible radiant power and the published results by previous authors as well.In the low sodium vapor pressure region, the total radiation Pr (W/cm) is influenced sharply by various discharge parameters, while in the high sodium vapor pressure region (above about 70 to 100 Torr), it is determined mainly by the power input Pin (W/cm) through the linear equation Pr≈0.80 (Pin-6.7) for a sapphire arc tube. It has been concluded that the high efficacy of a high-pressure sodium lamp stems from the low thermal conduction loss of its arc tube, as well as its high luminous efficacy of visible radiation.

• 社団法人照明学会の論文

著者

• Saito Naoki

  Light Division Matsushita Electronics Corporation

• AKUTSU Hidezoh

  Research Laboratory

関連論文

• Energy balance of a high-pressure sodium arc tube

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