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A spectral lamp is a sealed glass or quartz bulb that generally contains a small amount of some solid or gas. When excited by a high voltage, the sample will give off a pattern of colors that is the "signature" of the specific material contained in the lamp. Na and Hg lamps have small amounts of Sodium or Mercury which are vaporized inside of the device.

Both of these elements, by the way, are used in highway and city street lights. The Hg variety gives off "almost white" light, while the Na variety gives off orange/yellow light.

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