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Troland
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・ Troleandomycin
・ Troll
・ Troll (album)
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・ Troll (comics)
・ Troll (disambiguation)
・ Troll (Discworld)


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Troland : ウィキペディア英語版
Troland
The troland (symbol Td), named after Leonard T. Troland, is a unit of ''conventional retinal illuminance''. It is meant as a method for correcting photometric measurements of luminance values impinging on the human eye by scaling them by the effective pupil size. It is equal to retinal illuminance produced by a surface whose luminance is one nit when the apparent area of the entrance pupil of the eye is 1 square millimeter.〔 (answers.com )〕
The troland typically refers to the ordinary or photopic troland, which is defined in terms of the photopic luminance:
: \mathrm = \mathrm \times \mathrm ,
where ''L'' is the photopic luminance in cd m−2 and ''p'' is pupil area in mm2.
A scotopic troland is also sometimes defined:
: \mathrm = \mathrm \times \mathrm ,
where ''L′'' is the scotopic luminance in cd m−2 and ''p'' is pupil area in mm2.
== Conversions to other units==
〔(wolframalpha.com ) 〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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