也有证据说明这些气体也被用来照明。

There is also some evidence that the gas was used for light.

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照明用电约占全球用电总量的20%，改用更高效的照明灯即节能又减少了温室气体的排放。

With lighting accounting for some 20% of electricity use worldwide, switching to a more efficient system could both save energy and reduce emissions of climate-changing greenhouse gases.

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高压钠灯。高压钠灯和金属卤化物灯是目前高压气体放电灯中主要的高效照明产品。

Nadeng. - Nadeng and metal halide lamps is pressurized gas or electric, the main efficient lighting products.

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