Mercury-free HID headlamps are very similar to HID headlamps described in the previous section except they use zinc iodide as a substitute for mercury and the amount of xenon gas is increased.
无汞气体放电头灯与前面描述的气体放电头灯很像，只不过无汞灯使用碘化锌替代汞，并且增加了氙气含量。