The arc lamps should be replaced soon.

弧光灯应该马上更换掉。

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If the arc lamps are almost new, proceed as follows.

如果弧光灯几乎是新的，请照下面的继续。

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This trigger is the necessary ignition device of xenon long-arc lamps.

本触发器是长弧氙灯的(必备)引燃设备。

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Arc lamps stretched up and out, unfurling bold ribbons of light.

NPR: Elevating the World's Oldest Profession in Chicago

Mercury arc lamps (the kind used in football stadiums) are not much better, since they emit a lot of ultraviolet light, which contributes to astronomers' woes without illuminating the action in a way that the human eye can detect.

ECONOMIST: Going, going, nearly gone