The noun has one meaning:
Meaning #1:
luminous intensity measured in candelas
Synonym: candlepower
Light intensity
| WordNet: light intensity |
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| 5min Related Video: Light intensity |
| Wikipedia: Light intensity |
Several measures of light are commonly known as intensity. These generally are obtained by dividing a power, in watts, (or apparent power, in lumens) by a solid angle, a planar area, or a combination of the two:
The relationships are summarised in the table below.
| Radiometric | Photometric | |
|---|---|---|
| Angular | Radiant intensity, measured in watts per steradian (W/sr) | Luminous intensity, measured in lumens per steradian (lm/sr), or candela (cd) |
| Areal |
|
Total luminous flux in lux (lx) or lumens per square metre (cd·sr·m−2):
|
| Areal source with angular view | Radiance, commonly called "intensity" in astronomy and astrophysics (W·sr-1·m-2) | Luminance describes the amount of light that passes through or is emitted from a particular area, and falls within a given solid angle, in candela per square metre (cd/m2) |
See also
- Brightness, the subjective perception elicited by the luminance of a source
- Luminance, the photometric equivalent of radiance (lm·sr-1·m-2)
- Photometry
- Radiometry
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 | WordNet. WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved. Read more |
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| Wikipedia. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article "Light intensity". Read more |
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Mentioned in
- sciophyte (botany)
- distance-luminosity relation (astronomy)
- nonlinear refraction (optics)
- step-down photophobic response (physiology)
- step-up photophobic response (physiology)
- luminous-intensity distribution curve
- photometer
- photometry
- illuminator
- reciprocity failure (graphic arts)
- bistable optical device (optics)
- compensation depth (oceanography)
- consensual light reflex (neuroscience)
- isolux (optics)
