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  Encyclopedia of Keywords > Watt > Lumens   Michael Charnine

Keywords and Sections
ABSOLUTE LUMINOSITY CURVES
OUTPUT
QUANTITY
POWER CONSUMPTION
ACTUAL NUMBER
DEOXYGENATED BLOOD
VISIBLE WAVELENGTHS
ILLUMINATION
LIGHT SOURCE
LIGHT
WAVELENGTH
LUMINOUS EFFICACY
LIGHT OUTPUT
COMMON MEASURE
LUMINOUS INTENSITY
STERADIAN
CANDELA
LUX
ILLUMINANCE
LUMINOUS FLUX
WATTS
WATT
LUMENS
Review of Short Phrases and Links

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

Definitions

  1. Lumens are the standard measure of light output, but light is actually defined as energy evaluated by the eye.
  2. Lumens are a metric equivalent to foot-candles in that they are measured at an object you want to illuminate.
  3. Lumens are what we get from the hardware store when we purchase a light bulb.
  4. Lumens are meaningless for plants, as green plants do not utilize green light for photosynthesis. (Web site)
  5. Lumens is Sacramento's destination for indoor and outdoor lighting, ceiling fans, modern furniture and home accessories.

Absolute Luminosity Curves

  1. If the source is monochromatic (like a laser), you need the value of lumens per watt at a specific wavelength using the absolute luminosity curves. (Web site)

Output

  1. However, if we wish to characterize the output for the eye, then the output is measured in lumens, the photometric unit of luminous flux.

Quantity

  1. Another quantity that is often quoted in catalogues is lumens per watt. (Web site)

Power Consumption

  1. It is calculated by dividing the lamp's luminous flux, measured in lumens, by the power consumption, measured in watts. (Web site)

Actual Number

  1. The ratio between the actual number of lumens per watt and the theoretical maximum is expressed as a percentage known as the luminous efficiency. (Web site)

Deoxygenated Blood

  1. In general, veins function to return deoxygenated blood to the heart, and are essentially tubes that collapse when their lumens are not filled with blood. (Web site)

Visible Wavelengths

  1. Note that using lumens takes into account the visible wavelengths and how well we see various colours.

Illumination

  1. Illumination (by John Bercovitz) The Photometric System Light flux, for the purposes of illumination engineering, is measured in lumens. (Web site)

Light Source

  1. For a light source with mixed wavelengths, the number of lumens per watt can be calculated by means of the luminosity function. (Web site)
  2. Measure the total number of lumens of a light source and divide that into the cost for that light source.

Light

  1. The rate of flow of light per unit of time, especially the flux of visible light expressed in lumens. (Web site)
  2. It indicates the amount of light (lumens) emitted by the lamp for each unit of electrical power (Watts) used. (Web site)
  3. Lumens represent the time rate of transferring luminous energy; quantity of light.

Wavelength

  1. This is then corrected at each wavelength using the absolute luminosity curves to get luminous power in lumens. (Web site)

Luminous Efficacy

  1. Luminous efficacy is expressed in lumens per watt. (Web site)

Light Output

  1. Lumens - Unit of measure for total light output. (Web site)
  2. This is the ratio of light output from a lamp to the electric power it consumes and is measured in lumens per watt (LPW). (Web site)

Common Measure

  1. Lumens per Watt is a common measure of the "efficiency" of a light source. (Web site)

Luminous Intensity

  1. Luminous intensity is a much more useful measure, although lumens per watt is a handy way of comparing the output of otherwise similar lights.

Steradian

  1. The unit for brightness is called luminance, which is defined as lumens per square meter per steradian. (Web site)

Candela

  1. The output from a lamp is usually quoted in lumens, summed over all directions, together with the distribution diagram in candela, shown above. (Web site)

Lux

  1. Clearly, both lumens and lux (or foot-candles) refer specifically to human vision and not to the way plants see light. (Web site)
  2. The illumination is measured in "lux", a measurement of how many lumens falls on each square meter of surface. (Web site)
  3. Intensity: Measured in both lux and lumens.

Illuminance

  1. Illuminance is typically expressed in lux (lumens per square meter) or foot-candles (lumens per square foot). (Web site)
  2. Achieving an illuminance of 500 lux might be possible in a home kitchen with a single fluorescent light fixture with an output of 12,000 lumens. (Web site)

Luminous Flux

  1. Lumens The technical definition of lumen is this: A lumen is the standard measurement for a unit of luminous flux, a measure of the perceived power of light. (Web site)
  2. In this area the comparison is usually made as the efficiency in converting electrical energy into light energy (luminous flux), so lumens per watt.
  3. Luminous flux, measured in lumens, is a more commonly used quantity in photometry. (Web site)

Watts

  1. Watts are units of radiant flux while lumens are units of luminous flux. (Web site)
  2. Luminous Efficacy The light output (lumens) of a light source divided by the total power input (watts) to that source. (Web site)
  3. Luminous efficacy of a source is the ratio of lumens (total luminous flux) to watts (total electrical power input).

Watt

  1. Lumens per watt is a measure of efficiency in converting electrical energy to light. (Web site)
  2. They are somewhat more efficient when you take into account only the number of lumens per watt of electrical power, but they cost a lot more to produce.
  3. One watt of light at any single wavelength (or in a very narrow band) is, in lumens, 681 times the official photopic function of that wavelength.

Lumens

  1. The SI units for luminous flux are lumens, where a lumen is defined as a luminous intensity of one candela within a solid angle of one steradian.
  2. Similarly, luminous intensity is a measure of visible power per solid angle, expressed in candela (lumens per steradian). (Web site)
  3. In SI derived units, these are both measured in lux (lx) or lumens per square metre (cd·sr·m −2). In the CGS system, the unit of illuminance is the phot.

Categories

  1. Watt
  2. Optics > Light > Photometry > Luminous Flux
  3. Lux
  4. Illuminance
  5. Square Metre
  6. Books about "Lumens" in Amazon.com

Book: Keywen Category Structure


  Short phrases about "Lumens"
  Originally created: December 15, 2005.
  Links checked: February 24, 2013.
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