Lambert: Difference between revisions
From Glossary of Meteorology
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{{Term | |||
|Display title=lambert | |||
{{ | |Definitions={{Definition | ||
|Num=1 | |||
|Meaning=A cgs unit of [[luminance]] ( | |||
|Explanation=''or'' photometric [[ brightness|brightness]]) equal to one [[lumen]], or 1/π [[candela]] per square centimeter.<br/> This luminance is produce by a [[blackbody]] source of [[luminous]] intensity 1 candela at a distance of 1 centimeter. The corresponding [[SI]] (or mks) unit is the apostilb, a unit 10<sup>4</sup> smaller produced by 1 candela at a distance of 1 m. The sun's disk at [[zenith]] at [[sea level]] under [[clear]] skies has a luminance of about 470 000 lambert, while that of a 60-watt, inside-frosted, tungsten-filament light bulb is about 38 lambert. | |||
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Latest revision as of 06:15, 29 March 2024
A cgs unit of luminance (
or photometric brightness) equal to one lumen, or 1/π candela per square centimeter.
This luminance is produce by a blackbody source of luminous intensity 1 candela at a distance of 1 centimeter. The corresponding SI (or mks) unit is the apostilb, a unit 104 smaller produced by 1 candela at a distance of 1 m. The sun's disk at zenith at sea level under clear skies has a luminance of about 470 000 lambert, while that of a 60-watt, inside-frosted, tungsten-filament light bulb is about 38 lambert.
