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Encyclopedia > Electric light

Most of the industrialized world is lit by electric lights, which are used both at night and to provide additional light during the daytime. These lights are normally powered by the electric grid, but some run on local generators, and emergency generators serve as backups in hospitals and other locations where a loss of power could be catastrophic. Battery-powered lights, usually called "flashlights" or "torches", are used for portability and as backups when the main lights fail. This article or section does not cite any references or sources. ... The term grid has several meanings in various fields: in mathematics and geometry, a grid is a system of two sets of lines that intersect each other at a fixed angle, usually a right angle (i. ... “Dynamo” redirects here. ... Four double-A (AA) rechargeable cells A Duracell AA alkaline cell In science and technology, a galvanic cell is an electrochemical cell that stores chemical energy and makes it available in an electrical form, and a battery is a string of two or more cells in series. ...


Types

Types of electric lighting include: Lightning strikes during a night-time thunderstorm. ...

Different types of lights have vastly differing efficiencies. [1] An incandescent light bulb and its glowing filament. ... The 300,000-watt Plasma Arc Lamp in the Infrared Processing Center (IPC) at Oak Ridge National Laboratory An arc lamp is a device that produces light by the sparking (or arcing, from voltaic arc or electric arc) of a high current between two carbon rod electrodes. ... It has been suggested that this article or section be merged with Fluorescent lamp. ... A compact fluorescent lamp A fluorescent lamp is a type of electric lamp that excites argon and mercury vapor to create luminescence. ... Lighting neon lamp, two 220/230 volt and 110 V neon lamps and a screwdriver with neon lamp inside A neon lamp is a gas discharge lamp containing primarily neon gas at low pressure. ... Metal halide lamps, a member of the high-intensity discharge (HID) family of lamps, produce high light output for their size, making them a compact, powerful, and efficient light source. ... A photographic flash is a device that produces a flash of light required for indoor or other low light conditions. ... Experiment with a laser (likely an argon type) (US Military) In physics, a laser is a device that emits light through a specific mechanism for which the term laser is an acronym: light amplification by stimulated emission of radiation. ... Led is also the past tense of the verb to lead Blue, green and red LEDs. ... A 3. ... LBNL researcher examines prototype sulfur lamp. ...


) || Colour temperature
(kelvins) || Colour|| Color
rendering
index
White light is commonly described by its color temperature. ... The kelvin (symbol: K) is a unit increment of temperature and is one of the seven SI base units. ... Color is an important part of the visual arts. ... Colour rendering index, or CRI, is a measure of the quality of colour light, devised by the International Commission on Illumination (CIE). ...

Incandescent light bulb Continuous 12-17 1000-2500 2700 Warm white (yellowish) 100
Halogen lamp Continuous 16-23 3000-6000 3200 Warm white (yellowish) 100
Fluorescent lamp Mercury line + Phosphor 52-100 8000-20000 2700-5000* White (with a tinge of green) 15-85
Metal halide lamp quasi-Continuous 50-115 6000-20000 3000-4500 Cold White 65-93
Sulfur lamp Continuous 80-110 15000-20000 6000 Pale green 79
High pressure sodium broadband 55-140 10000-40000 1800-2200* Pinkish orange 0-70
Low pressure sodium narrow line 100-200 18000-20000 1800* Yellow, virtually no color rendering 0

*Color temperature is defined as the temperature of a black body emitting a similar spectrum; these spectra are quite different from those of black bodies. An incandescent light bulb and its glowing filament. ... In physics, continuous spectrum refers to a range of values which may be graphed to fill a range with closely-spaced or overlapping intervals. ... The incandescent light bulb uses a glowing wire filament heated to white-hot by electrical resistance, to generate light (a process known as thermal radiation). ... Fluorescent lamps in Shinbashi, Tokyo, Japan Assorted types of fluorescent lamps. ... General Name, Symbol, Number mercury, Hg, 80 Chemical series transition metals Group, Period, Block 12, 6, d Appearance silvery Standard atomic weight 200. ... Green screen A phosphor is a substance that exhibits the phenomenon of phosphorescence (sustained glowing after exposure to light or energised particles such as electrons). ... Metal halide lamps, a member of the high-intensity discharge (HID) family of lamps, produce high light output for their size, making them a compact, powerful, and efficient light source. ... LBNL researcher examines prototype sulfur lamp. ... A LPS / SOX streetlight at full power A sodium vapor lamp is a gas discharge lamp which uses sodium in an excited state to produce light. ... A LPS / SOX streetlight at full power A sodium vapor lamp is a gas discharge lamp which uses sodium in an excited state to produce light. ... As the temperature decreases, the peak of the black body radiation curve moves to lower intensities and longer wavelengths. ...


The most efficient source of electric light is the low-pressure sodium lamp. It produces an almost monochromatic orange light, which severely distorts color perception. For this reason, it is generally reserved for outdoor public lighting usages. Low-pressure sodium lights are favoured for public lighting by astronomers, since the light pollution that they generate can be easily filtered, contrary to broadband or continuous spectra. Something which is monochromatic has a single color. ... This time exposure photo of New York City shows sky glow, one form of light pollution. ...


Vendors

Ge may refer to: Gê, a group of indigenous Brazilian tribes and their Ge languages Ge (Cyrillic) (Г, г), a letter of the Cyrillic alphabet Ge with upturn (Ґ, ґ), a letter of the Ukrainian alphabet Nikolai Ge, a Russian painter Gē, an ancient Chinese dagger-axe Ge (genus), a genus of butterflies Also... This article or section does not cite its references or sources. ... Philips HQ in Amsterdam Koninklijke Philips Electronics N.V. (Royal Philips Electronics N.V.), usually known as Philips, (Euronext: PHIA, NYSE: PHG) is one of the largest electronics companies in the world. ...

Public lighting

The total amount of artificial light is sufficient for cities to be easily visible at night from the air, and from space. This wasted light should not be confused with the light pollution that burdens astronomers and others, although it is the source of it. This time exposure photo of New York City shows sky glow, one form of light pollution. ... A giant Hubble mosaic of the Crab Nebula, a supernova remnant Astronomy is the science of celestial objects (such as stars, planets, comets, and galaxies) and phenomena that originate outside the Earths atmosphere (such as auroras and cosmic background radiation). ...


Human-made lights highlight particularly developed or populated areas of the Earth's surface, including the seaboards of Europe, the eastern United States, and Japan.

  Results from FactBites:
 
Electric Light (0 words)
Electric light had been produced until then by aid of batteries, and the cost of their replacement, coupled with the comparatively small amount of power available from them and the low efficiency of lamps, had confined electric light to special applications.
Of course the first electric filament lamps, which awaited their discovery were poor and so initially more rewarding sources of illumination, predominantly the carbon arc was still in general use even several years after Edwardian times had drawn to a close.
Gas lamps were still the main way of producing light in buildings and so it was natural that one of the first applications of the dynamo was not to provide power for an electric light directly, but to provide fuel for gas lamps by breaking down water by electrolysis into hydrogen and oxygen.
Cave Related Statistics: First Caves with Electric Light (0 words)
The development of the electric light allowed a constant, pollution free and bright illumination of the caves.
This light did not use light bulbs, but electric arcs between coal electrodes, which were burning down and had to be replaced after some time.
Developed, electric light and opened to the public, it was the first cave with electric light in Italy.
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