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Visible light per unit solid angle
In photometry, luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle
Luminous_intensity
SI unit of luminous intensity
of luminous intensity. It measures the luminous power per unit solid angle emitted in a particular direction. A common wax candle has a luminous intensity
Candela
Optical Phenomenon
optics, Lambert's cosine law says that the observed radiant intensity or luminous intensity from an ideal diffusely reflecting surface or ideal diffuse
Lambert's_cosine_law
Luminous flux incident on a surface per area
perception. Similarly, luminous emittance is the luminous flux per unit area emitted from a surface. Luminous emittance is also known as luminous exitance. In SI
Illuminance
Perceived luminous power
One lumen is defined as the luminous flux of light produced by a light source that emits one candela of luminous intensity over a solid angle of one steradian
Luminous_flux
SI derived unit of visible light emission
(that uniformly radiates in all directions) with a luminous intensity of one candela has a total luminous flux of 1 cd × 4π sr = 4π cd⋅sr = 4π lm ≈ 12.57
Lumen_(unit)
Definition of the units kg, A, K and mol
cd, is the SI unit of luminous intensity in a given direction. It is defined by taking the fixed numerical value of the luminous efficacy of monochromatic
2019_revision_of_the_SI
How efficiently a source produces visible light
Luminous efficacy is a measure of how efficiently a light source produces visible light. It is the ratio of luminous flux to power, measured in lumens
Luminous_efficacy
Photometric measure
Luminance is a photometric measure of the luminous intensity per unit area of light travelling in a given direction. It describes the amount of light that
Luminance
System of quantities used in science and their interrelationships
electric current, thermodynamic temperature, amount of substance, and luminous intensity – and the relationships between those quantities in derived quantities
International System of Quantities
International_System_of_Quantities
Amount of light captured by a camera
column denote dimensions; "L", "T" and "J" are for length, time, and luminous intensity respectively, not the symbols for the units litre, tesla, and joule
Exposure_(photography)
Illumination devices attached to bicycles
produces light with about 1 candela of luminous intensity in all directions. A lamp can produce higher luminous intensity either by producing more light, or
Bicycle_lighting
Measurement of visible light
radiance (radiometric) Luminous flux (photometric) and radiant flux (radiometric) Luminous intensity (photometric) and radiant intensity (radiometric) In photometric
Photometry_(optics)
SI derived unit of luminance
System of Units (SI). The unit is based on the candela, the SI unit of luminous intensity, and the square metre, the SI unit of area. The nit (symbol: nt) is
Candela_per_square_metre
Perception of light level
column denote dimensions; "L", "T" and "J" are for length, time, and luminous intensity respectively, not the symbols for the units litre, tesla, and joule
Brightness
Topics referred to by the same term
sometimes called current intensity in older books Radiant intensity, power per unit solid angle (W/sr) Luminous intensity, luminous flux per unit solid angle
Intensity
Wick embedded in solid flammable substance
directions, the total radiant flux would be only about 18.40 mW. The luminous intensity of a typical candle is approximately one candela. The SI unit, candela
Candle
One of the seven units of measurement that define the metric system
temperature, the mole for amount of substance, and the candela for luminous intensity. The SI base units are a fundamental part of modern metrology, and
SI_base_unit
Modern form of the metric system
thermodynamic temperature), mole (mol, amount of substance), and candela (cd, luminous intensity). The system can accommodate coherent units for an unlimited number
International_System_of_Units
Unit of illuminance
column denote dimensions; "L", "T" and "J" are for length, time, and luminous intensity respectively, not the symbols for the units litre, tesla, and joule
Foot-candle
High-intensity electric light with a broad beam
for photometry illustrates the difference between luminous intensity and illuminance. Some intensity distributions do not possess full rotational (circular)
Floodlight
Deliberate use of light to achieve practical or aesthetic effects
the luminous intensity, all other photometric units are derived from the candela. Luminance for instance is a measure of the density of luminous intensity
Lighting
for various applications: Measurement of luminous flux of a light source Measurement of luminous intensity distribution from a source much smaller than
Goniophotometer
Flow of electric charge
originates from the French phrase intensité du courant (current intensity). Current intensity is often referred to simply as current. The I symbol was used
Electric_current
Width of the beam of light emitted by a light
width at half maximum (FWHM). Notably, the term intensity is used here as a shorthand for luminous intensity (not to be confused with illuminance); beam angle
Beam_angle
Intensity of electromagnetic radiation
"λ". Directional quantities are denoted with suffix "Ω". Candela Luminous intensity "Thermal insulation — Heat transfer by radiation — Physical quantities
Radiant_intensity
Description of the average spectral sensitivity of human visual perception of brightness
connected to the modern (1979) definition of the candela, the unit of luminous intensity. This arbitrary number made the new definition give numbers equivalent
Luminous_efficiency_function
Unit of measurement
Candlepower (abbreviated as cp or CP) is the unit of luminous intensity in the United States customary systems of measurement. It is currently defined
Candlepower
SI derived unit of illuminance
The lux (symbol: lx) is the unit of illuminance, or luminous flux per unit area, in the International System of Units (SI). It is equal to one lumen per
Lux
Measurement describing the power of an illumination
radiant intensity, radiance, irradiance, radiant exitance, radiosity, luminance, luminous flux, luminous intensity, illuminance, luminous emittance)
Spectral_power_distribution
density, inductance, temperature, information entropy, luminous intensity, luminance, luminous flux, illuminance, radiation. Notes: See Weight for detail
List_of_conversion_factors
Science of measurement and its application
electric current, thermodynamic temperature, amount of substance, and luminous intensity. By convention, each of these units are considered to be mutually
Metrology
Power transferred per unit area
radiant intensity, luminous intensity or irradiance, depending on the background of the person using the term. Radiance is also sometimes called intensity, especially
Intensity_(physics)
Perceived light energy
In photometry, luminous energy is the perceived energy of light. This is sometimes called the quantity of light. Luminous energy is not the same as radiant
Luminous_energy
Measure of distance in physical space
thermodynamic temperature T Θ kelvin K amount of substance n N mole mol luminous intensity Iv J candela cd See also History of the metric system International
Length
Topics referred to by the same term
are commonly known as intensity: Radiant intensity, a radiometric quantity measured in watts per steradian (W/sr) Luminous intensity, a photometric quantity
Light_intensity
Unit of measurement for luminance
column denote dimensions; "L", "T" and "J" are for length, time, and luminous intensity respectively, not the symbols for the units litre, tesla, and joule
Foot-lambert
Function specifying the behavior of a component in an electronic or control system
a photodetector might be the output voltage as a function of the luminous intensity of incident light of a given wavelength. The term transfer function
Transfer_function
Topics referred to by the same term
candéła in Wiktionary, the free dictionary. The candela is a unit of luminous intensity. Candela may also refer to: Candela, Apulia, comune in the Province
Candela_(disambiguation)
Terminology in physics
directly proportional to power, e.g., energy density, acoustic intensity, and luminous intensity. Energy quantities may also be labelled as power quantities
Power, root-power, and field quantities
Power,_root-power,_and_field_quantities
Decimal-based systems of measurement
the luminous intensity of a moderately bright candle, or 1 candle power. A 60 watt tungsten-filament incandescent light bulb has a luminous intensity of
Metric_system
Topics referred to by the same term
statistical measure of process capability Candlepower (cp), a measure of luminous intensity Centipoise (cP), a unit of viscosity CP symmetry, in particle physics
CP
Non-SI metric unit of luminance
column denote dimensions; "L", "T" and "J" are for length, time, and luminous intensity respectively, not the symbols for the units litre, tesla, and joule
Lambert_(unit)
Model
(Va/Vd)0.55 × current at design voltage Rerated luminous intensity = (Va/Vd)3.4 to 3.5 × Luminous intensity at design voltage Rerated life = (Va/Vd)−12 to
Lamp_rerating
German dance project
produced a song for a Norwegian Russefeiring event, this time called "Luminous Intensity" which was officially released on 19 April 2013. Italobrothers released
ItaloBrothers
of the following kinds of radiometric data: Luminous intensity distribution — captures luminous intensity data in multiple directions. Such data is efficient
List of file formats for luminaire radiometric data
List_of_file_formats_for_luminaire_radiometric_data
Reflection with light scattered at random angles
dispersion in a prism), so that all colors are reflected nearly with the same intensity. The vast majority of visible objects are seen primarily by diffuse reflection
Diffuse_reflection
Topical index of English Wikipedia articles about metrology and measurement
Information Length Level Luminance Photometry Luminous energy Luminous exposure Luminous flux Luminous intensity Mass Meteorology measurement Navigation Non-SI
Outline of metrology and measurement
Outline_of_metrology_and_measurement
Continuous progression from past to future
thermodynamic temperature T Θ kelvin K amount of substance n N mole mol luminous intensity Iv J candela cd See also History of the metric system International
Time
Ratio of the number of particles in a sample to Avogadro's constant
thermodynamic temperature T Θ kelvin K amount of substance n N mole mol luminous intensity Iv J candela cd See also History of the metric system International
Amount_of_substance
System of codes for unambiguously representing measurement units
the coulomb for charge, the kelvin for temperature, the candela for luminous intensity, and the radian for plane angle. The UCUM base units form a set of
Unified Code for Units of Measure
Unified_Code_for_Units_of_Measure
Topics referred to by the same term
energy J {\displaystyle {\mathsf {J}}} , the dimension symbol for luminous intensity j →, symbol for current density J/psi meson, a subatomic particle
J_(disambiguation)
Topics referred to by the same term
beehive or Western honey bee colony centicandela (ccd), an SI unit of luminous intensity denoting one hundredth of a candela Central composite design, an experimental
CCD
Optical effect
the phase angle of an object lit by the Sun decreases, the object's luminous intensity increases. This is partly due to the increased area lit, but is also
Opposition_surge
Measurable property of a material or system
kilogram kg M Thermodynamic temperature T kelvin K Θ Amount of substance n mole mol N Electric current i, I ampere A I Luminous intensity Iv candela cd J
Physical_quantity
Measure of illuminance
\mathrm {lux} =10\ \mathrm {kilolux} } Metric dimensions: Illuminance = luminous intensity × solid angle / length2 Illuminance Lumen (unit) Lux Photometry (optics)
Phot
Ratio between the useful output and the input of a machine
background). Therefore, the radiant intensity of a light source may be much greater than its luminous intensity, meaning that the source emits more energy
Energy_conversion_efficiency
3rd episode of the 3rd season of The X-Files
striking. The device was very powerful, producing 2.9 million cd of luminous intensity, and producing enough energy to "singe the grass." To keep Ribisi
D.P.O._(The_X-Files)
Class of units of measurement
104/π cd⋅m−2. The lumerg is a unit of luminous energy equal to 10−7 lumen-seconds (100 nlm s). The talbot (T) is a unit of luminous energy equal to one lumen-second
List_of_metric_units
Physical quantity of hot and cold
Arthur; Williams, Mark. "Stellar Evolution: The Life and Death of Our Luminous Neighbors". GS265. University of Michigan. Archived from the original on
Temperature
Amount of matter present in an object
thermodynamic temperature T Θ kelvin K amount of substance n N mole mol luminous intensity Iv J candela cd See also History of the metric system International
Mass
Primary frequency standard
at its melting point. After 1979, the candela was defined as the luminous intensity of a monochromatic visible light source of frequency 540 THz (i.e
Caesium_standard
Portable hand-held electric light
charged) batteries. The total light emitted is reported in lumens. Luminous intensity is determined by measuring the brightest spot in the beam produced
Flashlight
Process of assigning numbers to objects or events
length, mass, temperature, amount of substance, electric current and light intensity. Derived units are constructed from the base units: for example, the watt
Measurement
Gas discharge lamp that produces intense white light
the cathode. The light generation volume is cone-shaped, and the luminous intensity falls off exponentially moving from cathode to anode. Electrons passing
Xenon_arc_lamp
SI base unit of electric current
length, mass, temperature, electric current, amount of substance, and luminous intensity respectively) with all other SI units being defined using these. These
Ampere
Uppercase or lowercase
Dickinson), where specific words are capitalised to provide emphasis, intensity, or symbolic weight, regardless of their part of speech. It acts as a
Letter_case
Device to reflect radiation back to its source
of luminous intensity, RI, is the measure of a reflector performance, which is defined as the ratio of the strength of the reflected light (luminous intensity)
Retroreflector
Topics referred to by the same term
x-axis in Cartesian coordinates I, i, electric current I, isospin I, luminous intensity I, moment of inertia i, orbital inclination I (Roman number one),
I_(disambiguation)
Topics referred to by the same term
field through a surface integrated over the surface's area Luminous flux, luminous intensity integrated over solid angle. Used in photometry Magnetic flux
Flux_(disambiguation)
Eye reflex which alters the pupil's size in response to light intensity
millimeters and Φ ( t − τ ) {\displaystyle \Phi (t-\tau )} is the luminous intensity reaching the retina in a time t {\displaystyle t} , which can be described
Pupillary_light_reflex
1982 studio album by Lou Reed
All this, too, in a lean, guitar-dominated song cycle that has the luminous intensity of a Hejira or an Astral Weeks. Ira Robbins of Trouser Press praised
The_Blue_Mask
Flame lamp used in photometry
proposed its use as a standard flame for photometric purposes with a luminous intensity unit of the Hefnerkerze (HK). The lamp was specified as having a 40 mm
Hefner_lamp
Another three base units (for temperature, amount of substance, and luminous intensity) were added later. The early metric systems defined a unit of weight
Historical definitions of the SI base units
Historical_definitions_of_the_SI_base_units
Instrument for measuring humidity
(length, time, amount of substance, electric current, temperature, luminous intensity, mass). When cost, space, or fragility are important, other types
Hygrometer
Analysis of the dimensions of different physical quantities
current (I), absolute temperature (Θ), amount of substance (N) and luminous intensity (J). The symbols are by convention usually written in roman sans serif
Dimensional_analysis
French physicist (1841–1923)
luminous intensity, called the Violle, equal to the light emitted by 1 cm² of platinum at its melting point. It was the first unit of light intensity
Jules_Violle
(1993–1996) Leica Mini Zoom (1993–1997): Zoom lenses Vario Elmar 35–70 with luminous intensity 1:4-7,6. The design of the camera was created by Manfred Meinzer with
List_of_Leica_Camera_models
Topics referred to by the same term
hp (UK, US) = 0.7355 kW) Hefnerkerze, an old photometric unit of luminous intensity Hexokinase, an enzyme Sobolev space Hk, in mathematics Kyūkyoku!!
HK_(disambiguation)
CGS unit of luminance
column denote dimensions; "L", "T" and "J" are for length, time, and luminous intensity respectively, not the symbols for the units litre, tesla, and joule
Stilb_(unit)
Image luminance mapping function
in many fields of science this quantity is called luminous exitance, as opposed to luminous intensity, which is a different quantity. These distinctions
Gamma_correction
SI unit of luminous energy
column denote dimensions; "L", "T" and "J" are for length, time, and luminous intensity respectively, not the symbols for the units litre, tesla, and joule
Lumen_second
Weapon that fires flares
(long barrel); 16s to 1,300 m (short barrel) or 1,600 m (long barrel) Luminous intensity: mean 600,000 cd Illumination area: over 600 m (within 5 lux) Burning
Lyran_illuminating_mortar
Former French unit for measuring the intensity of light
is a former French unit for measuring the intensity of light. The unit was defined in 1860 as the intensity of a Carcel lamp with standard burner and
Carcel
Device that emits light to illuminate performers
beam of light where it reaches 10% of the maximum luminous intensity. The direction of maximum intensity is often the center of the beam. Most manufacturers
Stage_lighting_instrument
Vehicle lights
essentially similar to regulations in place in Scandinavia, with an axial luminous intensity limit of 1,500 candela, but automakers claimed it was too expensive
Daytime_running_lamp
Physical artifact that formerly defined the kilogram
the number of atoms in 12 grams of carbon 12 and the base unit of luminous intensity, candela, was defined as that of 1/683 watts per steradian of 540 THz
International Prototype of the Kilogram
International_Prototype_of_the_Kilogram
Unit of luminance
column denote dimensions; "L", "T" and "J" are for length, time, and luminous intensity respectively, not the symbols for the units litre, tesla, and joule
Apostilb
Indian laboratory to set standards
kelvin (for temperature), ampere (for current) and candela (for luminous intensity). Each modernized country, including India has a National Metrological
National Physical Laboratory of India
National_Physical_Laboratory_of_India
Related to Periodic Table
Still in use and accepted for use in (but not part of) the SI Candela Luminous intensity Platinum Luminance at melting point 6 Redefined in 1979 Millimetre
Mononuclidic_element
Semiconductor light source
practical electronic components in 1962, the earliest LEDs emitted low-intensity infrared (IR) light. Infrared LEDs are used in remote-control circuits
Light-emitting_diode
Width of an electromagnetic beam
angle is often defined as FWHM luminous intensity. The field angle for floodlights is the full width at 10% intensity. The beamwidth can be computed for
Beam_diameter
German mathematician and physicist (1801–1868)
capillary part now called a Geissler tube, by means of which the luminous intensity of feeble electric discharges was raised sufficiently to allow of
Julius_Plücker
points in a digital image at which the luminous intensity changes sharply. It also marks the points of luminous intensity changes of an object or spatial-taxon
Glossary_of_machine_vision
Oil lamp with a clockwork pump mechanism
The Carcel lamp was an efficient lighting device used in the nineteenth century for domestic purposes and in France as the standard measure for illumination
Carcel_lamp
Deprecated unit of luminance
is an old and deprecated measurement unit of luminance, used for self-luminous objects (dark luminance). The term comes from Greek skotos, meaning "darkness"
Skot_(unit)
Photographic film type
shades of gray, ranging from black to white, corresponding to the luminous intensity of each point on the photographed subject. Light, shade, form and
Color_motion_picture_film
Measure in 3-dimensional geometry
sphere is A = 4πr2. Defining luminous intensity and luminance, and the correspondent radiometric quantities radiant intensity and radiance Calculating spherical
Solid_angle
Luminous plasma created in an electric field
fire, furole, witchfire or witch's fire) is a weather phenomenon in which luminous plasma is created by a corona discharge from a rod-like object such as
St._Elmo's_fire
Species of marine plant
Density depends on the depth at which the meadow is located, the luminous intensity, and the type of substrate. According to the density of the foliar
Posidonia_oceanica
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