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A fluorescent lamp is a gas-discharge lamp that uses electricity to excite Mercury vapor. The excited mercury atoms produce short-wave ultraviolet light that then causes a phosphor to fluoresce, producing visible light.

The color a fluorescent lamp puts out is dependent on the type of phosphor it uses. Colored fluorescent lamps usually have a colored tube that together with the color rating produce the required color (red, blue, etc).

Fluorescent lamps are sold by their 'color temperature'. 'Cool White' is 6500K and is somewhat bluish. 3000K is usually labeled 'Kitchen and Bath', which is a bright more natural light. All florescent tubes are labeled as to their color temperature, and some brands also have a scale showing just where it's color is on the spectrum of available colors.

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