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用质谱计分析了高压钠（HPS）灯工作时,其外壳内的气体,在新的灯泡中,甲烷是主要气体,氩气是次要成份。在灯泡的寿命期间,外壳中氦气增加,而甲烷压强下降。将气体充入到工作着的高压钠灯的外壳中,测量了灯管电压,功率,流明输出和钠D线宽。影响灯泡性能的是与充入到外壳中的气体压强和种类有关。在三种气体（甲烷、氦和氩）中,甲烷对灯泡性能所产生的影响最大,而氩气最小。
Mass spectrometry was used to analyze the gas in the housing of a high-pressure sodium (HPS) lamp during operation. In the new lamp, methane is the main gas and argon is the secondary component. During the life of the bulb, the helium in the shell increases and the methane pressure drops. The gas was charged into the working high pressure sodium lamp housing and the lamp voltage, power, lumen output, and sodium D linewidth were measured. The performance of the bulb is related to the pressure and type of gas charged into the housing. Of the three gases (methane, helium and argon), methane has the most effect on bulb performance and argon has the smallest.