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This is a list of sources of light, the visible part of the electromagnetic spectrum.
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Radioluminescence is light resulting from bombardment by ionizing radiation.
A CD spectrometer
Color spectrographs of common light sources {{DEFAULTSORT:Light Sources Technology-related lists Electronics lists
Light
Light or visible light is electromagnetic radiation that can be perceived by the human eye. Visible light is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 te ...
sources produce photons from another energy source, such as heat, chemical reactions, or conversion of mass or a different frequency of electromagnetic energy, and include light bulbs and stars like the Sun. Reflectors (such as the moon, cat's eyes, and mirrors) do not actually produce the light that comes from them.
Incandescence
Incandescence is the emission of light from a hot body as a result of its temperature. * *
Combustion
Lamps
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Nuclear and high-energy particle
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* Astronomical objects
**Sun
The Sun is the star at the center of the Solar System. It is a nearly perfect ball of hot plasma, heated to incandescence by nuclear fusion reactions in its core. The Sun radiates this energy mainly as light, ultraviolet, and infrared radi ...
( sunlight, solar radiation
Solar irradiance is the power per unit area (surface power density) received from the Sun in the form of electromagnetic radiation in the wavelength range of the measuring instrument.
Solar irradiance is measured in watts per square metre ( ...
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** Star ( Starlight)
*** Nova / supernova / hypernova
A hypernova (sometimes called a collapsar) is a very energetic supernova thought to result from an extreme core-collapse scenario. In this case, a massive star (>30 solar masses) collapses to form a rotating black hole emitting twin energetic je ...
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**Meteor
A meteoroid () is a small rocky or metallic body in outer space.
Meteoroids are defined as objects significantly smaller than asteroids, ranging in size from grains to objects up to a meter wide. Objects smaller than this are classified as mi ...
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*Lightning
Lightning is a naturally occurring electrostatic discharge during which two electrically charged regions, both in the atmosphere or with one on the ground, temporarily neutralize themselves, causing the instantaneous release of an avera ...
( Plasma)
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Luminescence
Luminescence is emission of light by a substance not resulting from heat.Bioluminescence
Bioluminescence is light resulting from biochemical reaction by a living organism. * * * * Cavitation bubbles made by mantis shrimps * * * * * * * *Cathodoluminescence
Cathodoluminescence is light resulting from a luminescent material being struck by electrons.Chemiluminescence
Chemiluminescence is light resulting from achemical reaction
A chemical reaction is a process that leads to the IUPAC nomenclature for organic transformations, chemical transformation of one set of chemical substances to another. Classically, chemical reactions encompass changes that only involve the pos ...
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Cryoluminescence
Cryoluminescence is the emission of light when an object is cooled.Crystalloluminescence
Crystalloluminescence is light produced during crystallization.Electric discharge (Electrical energy)
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Electrochemiluminescence
Electrochemiluminescence is light resulting from anelectrochemical reaction
Electrochemistry is the branch of physical chemistry concerned with the relationship between electrical potential difference, as a measurable and quantitative phenomenon, and identifiable chemical change, with the potential difference as an outco ...
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Electroluminescence
Electroluminescence is light resulting from an electric current being passed through a substance.
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Mechanoluminescence
Mechanoluminescence is light resulting from a mechanical action on a solid. * Triboluminescence, light generated when bonds in a material are broken when that material is scratched, crushed, or rubbed * Fractoluminescence, light generated when bonds in certain crystals are broken by fractures * Piezoluminescence, light produced by the action of pressure on certain solids * Sonoluminescence, light resulting from imploding bubbles in a liquid when excited by soundPhotoluminescence
Photoluminescence is light resulting from absorption of photons. *Fluorescence
Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation. It is a form of luminescence. In most cases, the emitted light has a longer wavelength, and therefore a lower photon energy, tha ...
, the emission of light by a substance that has absorbed light or other electromagnetic radiation
*Phosphorescence
Phosphorescence is a type of photoluminescence related to fluorescence. When exposed to light (radiation) of a shorter wavelength, a phosphorescent substance will glow, absorbing the light and reemitting it at a longer wavelength. Unlike fluo ...
, the delayed re-emission of light by substance that has absorbed it
Radioluminescence
Radioluminescence is light resulting from bombardment by ionizing radiation.
Thermoluminescence
Thermoluminescence is light from the re-emission of absorbed energy when a substance is heated.See also
* List of reflected light sources *Luminous efficacy
Luminous efficacy is a measure of how well a light source produces visible light. It is the ratio of luminous flux to power, measured in lumens per watt in the International System of Units (SI). Depending on context, the power can be either the ...
* Photometry (optics)
References
External links
A CD spectrometer
Color spectrographs of common light sources {{DEFAULTSORT:Light Sources Technology-related lists Electronics lists