"Tubelight" redirects here. For other uses, see Tubelight (disambiguation).
For Lamp sizes and designations, see Fluorescent-lamp formats.
Linear fluorescent lamps illuminating a pedestrian tunnelTop: two non-integrated compact fluorescent lamps. Bottom: two fluorescent tube lamps. Both types require a ballast in the light fixture. A matchstick, left, is shown for scale.
Integrated compact fluorescent lamps of different shapes with E27 socket and an electronic ballast in the base
Typical F71T12 100 W G13 bi-pin lamp used in tanning beds. The (Hg) symbol indicates that this lamp contains mercury. In the US, this symbol is now required on all mercury-containing fluorescent lamps.[1]A "tombstone" style lamp-holder for T12 and T8 G13 bi-pin fluorescent lampsInside the lamp end of a preheat G13 lamp. In this lamp, the filament is surrounded by an oblong metal cathode shield, which helps reduce lamp end darkening.[2]
A fluorescent lamp, or fluorescent tube, is a low-pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. An electric current in the gas excites mercury vapor, which produces short-wave ultraviolet light that then causes a phosphor coating on the inside of the lamp to glow. A fluorescent lamp converts electrical energy into useful light much more efficiently than an incandescent lamp. The typical luminous efficacy of fluorescent lighting systems is 50–100 lumens per watt, several times the efficacy of incandescent bulbs with comparable light output. For comparison, the luminous efficiency of an incandescent bulb may only be 16 lumens per watt.
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. Compact fluorescent lamps made in the same sizes as incandescent lamp bulbs are used as an energy-saving alternative to incandescent lamps in homes.
In the United States, fluorescent lamps are classified as universal waste. The United States Environmental Protection Agency recommends that fluorescent lamps be segregated from general waste for recycling or safe disposal, and some jurisdictions require recycling of them.[3]
^"Mercury-containing Lights and Lamps as Universal Waste". Washington State Department of Ecology. Archived from the original on 2016-06-04. Retrieved 2016-06-11.
^M. A. Laughton. Electrical Engineer's Reference Book Sixteenth Edition, Newnes, 2003 ISBN 0-7506-4637-3, pp. 21-12.
^Mercury-Containing Light Bulb (Lamp) Recycling | Universal Waste | US EPA Archived 2015-06-29 at the Wayback Machine.
A fluorescentlamp, or fluorescent tube, is a low-pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. An electric...
fluorescentlamp (CFL) examples A compact fluorescentlamp (CFL), also called compact fluorescent light, energy-saving light and compact fluorescent tube...
Fluorescentlamp recycling is the recovery of the materials of a spent fluorescentlamp for the manufacture of new products. Glass tubing can be turned...
Fluorescentlamps have been suggested to affect human health in various ways. New lighting systems have not used magnetic ballasts since the turn of the...
with sulfur vapor or metal halides, and fluorescent induction lamps, which are like a conventional fluorescentlamp bulb that induces current with an external...
energy-efficient than equivalent incandescent lamps and fluorescentlamps. The most efficient commercially available LED lamps have efficiencies exceeding 200 lumens...
Low-pressure mercury lamps High-pressure mercury lamps Excimer lamps LEDs Low-pressure mercury lamps are very similar to a fluorescentlamp, with a wavelength...
familiar and widely used example is the inductive ballast used in fluorescentlamps to limit the current through the tube, which would otherwise rise...
produce light by means of an electric arc through a gas, such as fluorescentlamps, and LED lamps, which produce light by a flow of electrons across a band gap...
may be specially designed fluorescentlamps, mercury-vapor lamps, light-emitting diodes (LEDs), lasers, or incandescent lamps. In medicine, forensics,...
common everyday application is in (gas-discharge) fluorescentlamps and LED lamps, in which fluorescent coatings convert UV or blue light into longer-wavelengths...
gas discharge lamps, which produce light by an arc between metal electrodes through a gas in a glass bulb. The common fluorescentlamp is a low-pressure...
fluorescents and 20,000–30,000 hours for lighting LEDs. Most incandescent bulbs can be replaced by fluorescentlamps, high-intensity discharge lamps,...
not prosper commercially. Plasma lamps with an internal phosphor coating are called external electrode fluorescentlamps (EEFL); these external electrodes...
similar to a conventional lamp. Standard and halogen incandescent bulbs are much less efficient than LED and compact fluorescentlamps, and therefore have been...
developed alongside it. The development of high-efficiency, low-cost fluorescentlamps led to a reliance on electric light and a uniform blanket approach...
sources such as fluorescent and high intensity discharge (HID) lamps. Some lamps require the ballast to have thermal protection. fluorescent light: A tube...
environment inside the lamp. Fluorescent tanning lamps require an electrical ballast to limit the amount of current going through the lamp. While the resistance...
A fluorescentlamp crusher is a device that crushes and stores spent fluorescentlamps prior to processing at a recycling facility, while controlling the...
lamps. A black light lamp emits long-wave UV‑A radiation and little visible light. Fluorescent black light lamps work similarly to other fluorescent lamps...
industry. Fluorescentlamps typically require a two-pin, unthreaded socket. Not all lamps require a socket; for example, some miniature lamps have wire...
fluorescence to produce light Compact fluorescentlamp – Fluorescentlamps with folded tubes, often with built-in ballast Tanning lamp – Device which produces ultraviolet...
reviewed the connections between light from fluorescentlamps, especially from compact fluorescentlamp, and numerous human diseases, with results including:...
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