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57 relations: Antares, Arc lamp, Betelgeuse, Black body, Candela, Candle, Capella, Coefficient of utilization, Color rendering index, Color temperature, Compact fluorescent lamp, Digital Light Processing, Dimensionless quantity, Edison screw, Electrical ballast, Electrical efficiency, Electron-stimulated luminescence, Fluorescent lamp, Gas mantle, Gas-discharge lamp, Halogen lamp, Heat, Human eye, HyperPhysics, Incandescent light bulb, Infrared, International Commission on Illumination, International System of Units, Light pollution, Light-emitting diode, List of light sources, Lumen (unit), Luminosity function, Luminous flux, Mercury (element), Mercury-vapor lamp, Metal-halide lamp, Photometry (optics), Photopic vision, Planck's law, Plasma display, Power (physics), Radiant flux, Scotopic vision, Spectral sensitivity, Steradian, Sulfur lamp, Sun, Tungsten, Ultra-high-performance lamp, ..., Ultraviolet, Visible spectrum, Wall-plug efficiency, Watt, Wavelength, Xenon, Xenon arc lamp. Expand index (7 more) »
Antares
Antares, also designated Alpha Scorpii (α Scorpii, abbreviated Alpha Sco, α Sco), is on average the fifteenth-brightest star in the night sky, and the brightest star in the constellation of Scorpius.
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Arc lamp
An arc lamp or arc light is a lamp that produces light by an electric arc (also called a voltaic arc).
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Betelgeuse
Betelgeuse, also designated Alpha Orionis (α Orionis, abbreviated Alpha Ori, α Ori), is the ninth-brightest star in the night sky and second-brightest in the constellation of Orion.
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Black body
A black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence.
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Candela
The candela (or; symbol: cd) is the base unit of luminous intensity in the International System of Units (SI); that is, luminous power per unit solid angle emitted by a point light source in a particular direction.
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Candle
A candle is an ignitable wick embedded in wax, or another flammable solid substance such as tallow, that provides light, and in some cases, a fragrance.
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Capella
Capella, also designated Alpha Aurigae (α Aurigae, abbreviated Alpha Aur, α Aur), is the brightest star in the constellation of Auriga, the sixth-brightest in the night sky, and the third-brightest in the northern celestial hemisphere after Arcturus and Vega.
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Coefficient of utilization
A coefficient of utilization (CU) is a measure of the efficiency of a luminaire in transferring luminous energy to the working plane in a particular area.
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Color rendering index
A color rendering index (CRI) is a quantitative measure of the ability of a light source to reveal the colors of various objects faithfully in comparison with an ideal or natural light source.
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Color temperature
The color temperature of a light source is the temperature of an ideal black-body radiator that radiates light of a color comparable to that of the light source.
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Compact fluorescent lamp
A compact fluorescent lamp (CFL), also called compact fluorescent light, energy-saving light, and compact fluorescent tube, is a fluorescent lamp designed to replace an incandescent light bulb; some types fit into light fixtures designed for incandescent bulbs.
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Digital Light Processing
Digital Light Processing (DLP) is a display device based on optical micro-electro-mechanical technology that uses a digital micromirror device.
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Dimensionless quantity
In dimensional analysis, a dimensionless quantity is a quantity to which no physical dimension is assigned.
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Edison screw
Edison screw (ES) is a standard socket for light bulbs in North America.
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Electrical ballast
An electrical ballast is a device placed in line with the load to limit the amount of current in an electrical circuit.
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Electrical efficiency
The efficiency of an entity (a device, component, or system) in electronics and electrical engineering is defined as useful power output divided by the total electrical power consumed (a fractional expression), typically denoted by the Greek small letter eta (η – ήτα).
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Electron-stimulated luminescence
Electron-stimulated luminescence (ESL) was a claimed method of producing light by cathodoluminescence, i.e. by a beam of electrons made to hit a fluorescent phosphor surface.
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Fluorescent lamp
A fluorescent lamp, or fluorescent tube, is a low-pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light.
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Gas mantle
An incandescent gas mantle, gas mantle or Welsbach mantle is a device for generating bright white light when heated by a flame.
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Gas-discharge lamp
Gas-discharge lamps are a family of artificial light sources that generate light by sending an electric discharge through an ionized gas, a plasma.
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Halogen lamp
A halogen lamp, also known as a tungsten halogen, quartz-halogen or quartz iodine lamp, is an incandescent lamp consisting of a tungsten filament sealed into a compact transparent envelope that is filled with a mixture of an inert gas and a small amount of a halogen such as iodine or bromine.
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Heat
In thermodynamics, heat is energy transferred from one system to another as a result of thermal interactions.
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Human eye
The human eye is an organ which reacts to light and pressure.
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HyperPhysics
HyperPhysics is an educational website about physics topics.
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Incandescent light bulb
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light with a wire filament heated to such a high temperature that it glows with visible light (incandescence).
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Infrared
Infrared radiation (IR) is electromagnetic radiation (EMR) with longer wavelengths than those of visible light, and is therefore generally invisible to the human eye (although IR at wavelengths up to 1050 nm from specially pulsed lasers can be seen by humans under certain conditions). It is sometimes called infrared light.
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International Commission on Illumination
The International Commission on Illumination (usually abbreviated CIE for its French name, Commission internationale de l'éclairage) is the international authority on light, illumination, colour, and colour spaces.
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International System of Units
The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system, and is the most widely used system of measurement.
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Light pollution
Light pollution, also known as photopollution, is the presence of anthropogenic light in the night environment.
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Light-emitting diode
A light-emitting diode (LED) is a two-lead semiconductor light source.
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List of light sources
This is a list of sources of light, including both natural and artificial processes that emit light.
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Lumen (unit)
The lumen (symbol: lm) is the SI derived unit of luminous flux, a measure of the total quantity of visible light emitted by a source.
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Luminosity function
A luminosity function or luminous efficiency function describes the average spectral sensitivity of human visual perception of brightness.
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Luminous flux
In photometry, luminous flux or luminous power is the measure of the perceived power of light.
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Mercury (element)
Mercury is a chemical element with symbol Hg and atomic number 80.
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Mercury-vapor lamp
A mercury-vapor lamp is a gas discharge lamp that uses an electric arc through vaporized mercury to produce light.
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Metal-halide lamp
A metal-halide lamp is an electrical lamp that produces light by an electric arc through a gaseous mixture of vaporized mercury and metal halides (compounds of metals with bromine or iodine).
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Photometry (optics)
Photometry is the science of the measurement of light, in terms of its perceived brightness to the human eye.
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Photopic vision
Photopic vision is the vision of the eye under well-lit conditions (luminance level 10 to 108 cd/m2).
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Planck's law
Planck's law describes the spectral density of electromagnetic radiation emitted by a black body in thermal equilibrium at a given temperature T. The law is named after Max Planck, who proposed it in 1900.
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Plasma display
A plasma display panel (PDP) is a type of flat panel display common to large TV displays or larger.
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Power (physics)
In physics, power is the rate of doing work, the amount of energy transferred per unit time.
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Radiant flux
In radiometry, radiant flux or radiant power is the radiant energy emitted, reflected, transmitted or received, per unit time, and spectral flux or spectral power is the radiant flux per unit frequency or wavelength, depending on whether the spectrum is taken as a function of frequency or of wavelength.
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Scotopic vision
Scotopic vision is the vision of the eye under low-light levels.
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Spectral sensitivity
Spectral sensitivity is the relative efficiency of detection, of light or other signal, as a function of the frequency or wavelength of the signal.
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Steradian
No description.
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Sulfur lamp
The sulfur lamp (also sulphur lamp) is a highly efficient full-spectrum electrodeless lighting system whose light is generated by sulfur plasma that has been excited by microwave radiation.
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Sun
The Sun is the star at the center of the Solar System.
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Tungsten
Tungsten, or wolfram, is a chemical element with symbol W (referring to wolfram) and atomic number 74.
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Ultra-high-performance lamp
The ultra-high-performance lamp, a high-pressure mercury arc lamp often known by the Philips trademark UHP, was originally known as the ultra-high-pressure lamp, because the internal pressure was as much as 200 atmospheres.
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Ultraviolet
Ultraviolet (UV) is electromagnetic radiation with a wavelength from 10 nm to 400 nm, shorter than that of visible light but longer than X-rays.
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Visible spectrum
The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye.
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Wall-plug efficiency
In optics, wall-plug efficiency or radiant efficiency is the energy conversion efficiency with which the system converts electrical power into optical power.
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Watt
The watt (symbol: W) is a unit of power.
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Wavelength
In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats.
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Xenon
Xenon is a chemical element with symbol Xe and atomic number 54.
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Xenon arc lamp
A xenon arc lamp is a highly specialized type of gas discharge lamp, an electric light that produces light by passing electricity through ionized xenon gas at high pressure.
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References
[1] https://en.wikipedia.org/wiki/Luminous_efficacy
