21 Facts About Fluorescent lamp

Fluorescent lamp, or fluorescent tube, is a low-pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light.

Fluorescent lamp fixtures are more costly than incandescent lamps because, among other things, they require a ballast to regulate current through the lamp, but the initial cost is offset by a much lower running cost.

Fluorescent lamp made the important observation that the glow in the tube shifted position when in proximity to an electromagnetic field.

Fluorescent lamp went on to apply thin coatings of luminescent materials to the surfaces of these tubes.

Fluorescent lamp invented a fluorescent lamp in 1896 that used a coating of calcium tungstate as the fluorescing substance, excited by X-rays, but although it received a patent in 1907, it was not put into production.

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The Fluorescent lamp used a smaller bore bulb and higher current operating at higher pressures.

The patent application indicated that the lamp had been created as a superior means of producing ultraviolet light, but the application contained a few statements referring to fluorescent illumination.

Fluorescent lamp tube is filled with a mix of argon, xenon, neon, or krypton, and mercury vapor.

The inner surface of the lamp is coated with a fluorescent coating made of varying blends of metallic and rare-earth phosphor salts.

The Fluorescent lamp's electrodes are typically made of coiled tungsten and are coated with a mixture of barium, strontium and calcium oxides to improve thermionic emission.

Terminal voltage across an operating Fluorescent lamp varies depending on the arc current, tube diameter, temperature, and fill gas.

The Fluorescent lamp holders have a "disconnect" socket at the low-voltage end which disconnects the ballast when the tube is removed, to prevent electric shock.

Life expectancy of a fluorescent lamp is primarily limited by the life of the cathode electrodes.

Every time the Fluorescent lamp is started, and during operation, some small amount of the cathode coating is sputtered off the electrodes by the impact of electrons and heavy ions within the tube.

Spectrum of light emitted from a fluorescent lamp is the combination of light directly emitted by the mercury vapor, and light emitted by the phosphorescent coating.

So, a dim 2700 K incandescent lamp appears comfortable and a bright 5000 K lamp appears natural, but a dim 5000 K fluorescent lamp appears too pale.

Fluorescent lamp use is declining as LED lighting, which is more energy efficient and doesn't contain mercury, is replacing fluorescents.

Fluorescent lamp efficacy is dependent on lamp temperature at the coldest part of the lamp.

Higher initial cost of a fluorescent lamp compared with an incandescent lamp is usually compensated for by lower energy consumption over its life.

Extra energy used to start a fluorescent lamp is equivalent to a few seconds of normal operation; it is more energy-efficient to switch off lamps when not required for several minutes.

Overdriving a fluorescent lamp is a method of getting more light from each tube than is obtained under rated conditions.