The Info List - Incandescent

--- Advertisement ---

is the emission of electromagnetic radiation (including visible light) from a hot body as a result of its temperature.[1] The term derives from the Latin verb incandescere, to glow white.[2] Incandescence
is a special case of thermal radiation. Incandescence usually refers specifically to visible light, while thermal radiation refers also to infrared or any other electromagnetic radiation. For information on the intensity and spectrum (color) of incandescence, see thermal radiation.


1 Observation and use 2 Figurative use 3 See also 4 References 5 External links

Observation and use[edit] Main article: Thermal radiation In practice, virtually all solid or liquid substances start to glow around 798 K (525 °C) (977 ˚F), with a mildly dull red color, whether or not a chemical reaction takes place that produces light as a result of an exothermic process. This limit is called the Draper point. The incandescence does not vanish below that temperature, but it is too weak in the visible spectrum to be perceivable. At higher temperatures, the substance becomes brighter and its color changes from red towards white and finally blue. Incandescence
is exploited in incandescent light bulbs, in which a filament is heated to a temperature at which a fraction of the radiation falls in the visible spectrum. The majority of the radiation however, is emitted in the infrared part of the spectrum, rendering incandescent lights relatively inefficient as a light source.[3] If the filament could be made hotter, efficiency would increase; however, there are currently no materials able to withstand such temperatures which would be appropriate for use in lamps. More efficient light sources, such as fluorescent lamps and LEDs, do not function by incandescence.[4] Sunlight
is the incandescence of the "white hot" surface of the sun. Figurative use[edit] The word incandescent is also used figuratively to describe a person who is so angry that they are imagined to glow or burn red hot or white hot.[5] See also[edit]

The visible color of an object heated to incandescence (from 550°C to 1300°C).

Red heat List of light sources


^ Dionysius Lardner
Dionysius Lardner
(1833). Treatise on Heat. Longman, Rees, Orme, Brown, Green & Longman. Archived from the original on 2017-12-21. The state in which a heated body, naturally incapable of emitting light, becomes luminous, is called a state of incandescence.  ^ John E. Bowman (1856). An Introduction to Practical Chemistry, Including Analysis (Second American ed.). Philadelphia: Blanchard and Lea. Archived from the original on 2017-12-21.  ^ William Elgin Wickenden (1910). Illumination and Photometry. McGraw-Hill. Archived from the original on 2017-12-21.  ^ Koones, Sheri (2012-10-01). Prefabulous + Almost Off the Grid: Your Path to Building an Energy-Independent Home. Abrams. ISBN 9781613123966.  ^ Example 1:'...the stadium positively crackled with the incandescent anger of anguished supporters.' Mark Wilson, 'Rangers 1 Unirea 4', Daily Mail, 21 October 2009 "Archived copy". Archived from the original on 2009-10-23. Retrieved 2009-11-01. . Example 2: '...there's something very funny about incandescent anger.' Mark Fisher, 'Jerry has a cross to bear', The Scotsman, 5 March 2006 [1].

External links[edit]

Figurative use: Rangers 1 Unirea-Urziceni 4 etc.

v t e

Lamps Lighting


Accent lighting Color temperature Efficiency Glare Lamp Light
fixture Light
pollution Lightbulb socket Task lighting

Methods of generation


Regular Halogen Nernst Parabolic aluminized reflector (PAR)



Fluorescent lamp (compact) Fluorescent induction


laser lamp

Chemiluminescent Solid-state





field-induced polymer


Acetylene/Carbide Argand Campfire Candle Carcel Diya Flare Gas Kerosene Lantern Limelight Oil Rushlight Safety Tilley Torch

Electric arc

Carbon arc Klieg light Yablochkov candle

Gas discharge

Deuterium arc Neon Plasma Sulfur Xenon arc Xenon flash

High-intensity discharge (HID)

Hydrargyrum medium-arc iodide (HMI) Hydrargyrum quartz iodide (HQI) Mercury-vapor Metal-halide


Sodium vapor

Theatrical Cinematic

Floodlight Footlight Gobo Scoop Spotlight

ellipsoidal reflector

Stage lighting
Stage lighting


Aircraft warning Balanced-arm lamp Chandelier Emergency light Gas lighting Gooseneck lamp Intelligent street lighting Light
tube Nightlight Neon lighting Pendant light Recessed light Sconce Street light Torchère Track lighting Troffer




Glow stick Headlamp (outdoor) Lantern Laser
pointer Navigation light Searchlight Solar lamp

Industrial Scientific

Germicidal Grow light Infrared
lamp Stroboscope Tanning

Display Decorative

Aroma lamp Black light Bubble light Christmas lights Crackle tube DJ lighting Electroluminescent wire Lava lamp Marquee Plasma globe Strobe light

Related topics

Bioluminescence Chemiluminescence Electroluminescence Laser Photoluminescence Radio