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  Encyclopedia of Keywords > Physics > Optics > Light > Photometry > Luminous Flux   Michael Charnine

Keywords and Sections
RADIANT FLUX
LUMINOUS FLUX
LUMEN
EYE
PERCEIVED POWER
UNIT
LAMP
PER UNIT AREA
LIGHT SOURCE
POINT SOURCE
TOTAL LUMINOUS
PHOTODETECTOR
FLUX LUMEN
RATIO BETWEEN
AREA
Review of Short Phrases and Links

    This Review contains major "Luminous Flux"- related terms, short phrases and links grouped together in the form of Encyclopedia article.

Definitions

  1. The luminous flux is a weighted sum of the power at all wavelengths in the visible band.
  2. Luminous flux is a measure of the energy emitted by a light source in all directions. (Web site)
  3. Luminous flux is a measure of the power of visible light.
  4. The luminous flux is a very basic unit of measurement for light. (Web site)
  5. Luminous Flux - The rate of flow of radiant energy. (Web site)

Radiant Flux

  1. It is the ratio of emitted luminous flux to radiant flux. (Web site)
  2. The luminous flux, measured in lumens (lm), is the radiant flux of a source evaluated in terms of the human visual response.

Luminous Flux

  1. In physics, specifically photometry (optics), the lumen (symbol: lm) is the SI derived unit of luminous flux.
  2. An illuminance of 1 lx occurs when a luminous flux of 1 lm is evenly distributed over an area of 1 square meter. (Web site)
  3. Lumen (lm) Represents luminous flux (cd-sr) Luminance The intensity of a source of light. (Web site)

Lumen

  1. Luminous flux is measured in lumen, while luminous intensity is measured in lumen per steradian, also called a candela. (Web site)
  2. It is calculated by dividing the lamp's luminous flux, measured in lumens, by the power consumption, measured in watts.

Eye

  1. This power must be factored by the sensitivity of the human eye to determine luminous flux in lumens. (Web site)
  2. One watt of radiant power at 555 nm - the wavelength at which the typical human eye is most sensitive - is equivalent to a luminous flux of 680 lumens.
  3. Luminous flux, F, is akin to the time rate of flow of photons except that the photons are pro-rated according to how bright they appear to the eye. (Web site)

Perceived Power

  1. The lumen (symbol: lm) is the SI unit of luminous flux, a measure of the perceived power of light. (Web site)
  2. In photometry, luminous flux or luminous power is the measure of the perceived power of light.

Unit

  1. A phot is a photometric unit of illuminance, or luminous flux through an area.
  2. The lumen is the unit of luminous flux, and is defined in terms of the candela, an SI base unit like the meter or second. (Web site)

Lamp

  1. For instance, the Luminous Flux for a 100W incandescent lamp is approximately 1700 lm. (Web site)
  2. Thus, luminous flux is a weighted average of the Radiant Flux in the visible spectrum. (Web site)
  3. Illumination, E, is the areal density of incident luminous flux. (Web site)
  4. The first lamp emits a luminous flux of 2145lm is 4.3m from the wood. (Web site)
  5. Luminous flux Photopic (black) and scotopic [1] (green) luminosity functions.

Per Unit Area

  1. In photometry, illuminance is the total luminous flux incident on a surface, per unit area.
  2. The total luminous flux E emitted per unit area from a lambertian surface of luminance B is easily calcuated. (Web site)

Light Source

  1. The luminous flux (or visible energy) in a light source is defined by the photopic luminosity function.
  2. All the radiated power emitted by a light source and perceived by the eye is called luminous flux .
  3. Light sources used for illumination are rated in terms of the total luminous flux output, often abbreviated to luminous flux, measured in lumens. (Web site)

Point Source

  1. Luminous flux is not used to compare brightness, as this is a subjective perception which varies according to the distance from the light source. (Web site)
  2. The unit of luminous flux; the luminous flux on a unit surface all points of which are at unit distance from a point source of one candle. (Web site)
  3. The Luminous Flux from a monochromatic source producing light at a single wavelength is easiest to determine. (Web site)
  4. Terms The quantity of luminous flux emitted within a unit solid angle (one steradian) by a point source with one candella intensity in all directions. (Web site)

Total Luminous

  1. The ratio of the total luminous flux to the radiant flux is called the luminous efficacy.
  2. In US practice, total luminous flux is defined by the mean spherical candle power I 0. The unit is the mscp.
  3. EXAMPLE: A certain 100-watt bulb emits a total luminous flux of 1200 lm, distributed uniformly over a hemisphere. (Web site)

Photodetector

  1. The luminous flux collected by the photometer lens (and directed to the photodetector) is proportional to the projected area. (Web site)
  2. A typical 100 watt incandescent bulb has a luminous flux of about 1700 lumens. (Web site)
  3. That luminous flux will enter the photodetector and permit a luminance measurement.

Flux Lumen

  1. The SI unit of luminous flux is the lumen (lm).
  2. Last check: 2007-10-12) The unit of luminous flux F is the lumen (lm). (Web site)
  3. Luminous Flux - www.smarter.com Find and Compare prices on luminous flux at Smarter.com.
  4. Luminous Flux | Lumen As with luminous intensity, the luminous flux of light with other wavelengths can be calculated using the CIE photometric curve. (Web site)

Ratio Between

  1. This is the ratio between the total luminous flux emitted by a device and the total amount of input power (electrical, etc.) it consumes.
  2. OSRAM SYLVANIA:Sylvania Automotive Lighting Catalog It is the ratio between luminous flux and the area to be illuminated. (Web site)
  3. The ratio between luminous flux and the power consumed is known as Not all the luminous flux emitted by the lamp reaches the work plane. (Web site)

Area

  1. The same luminous flux is now spread over a larger area as the angle between the axis of the flashlight and the normal to the surface increases. (Web site)
  2. The difference between the lux and the lumen is that the lux takes into account the area over which the luminous flux is spread.

Categories

  1. Physics > Optics > Light > Photometry
  2. Glossaries > Glossary of Physical Quantity /
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  Short phrases about "Luminous Flux"
  Originally created: June 24, 2008.
  Links checked: April 19, 2013.
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