6.1.1_Lighting Vocab Flashcards by Dickinson Donner

Q

amount of light put out by a source

A

intensity

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Q

amount of light arriving at a surface

A

illumination

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Q

illumination measured in

A

footcandles

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Q

intensity measured in

A

candlepower

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Q

lumen

A

light thru
1ft2
1ft away
from source 1 candlepower

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Q

density of luminous energy

A

illuminance

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Q

direct light falling on a surface

A

incident light

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Q

brightness leaving a surface

A

luminance

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Q

luminance measured in

A

lamberts

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Q

coefficient of transmission is a ratio for glass

A

transmitted light / incident

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Q

COE of clear glass

A

85%

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Q

COE frosted glass

A

70-85%

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Q

zonal cavity method is used to calculate

A

luminaires

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Q

Reference Illumination Levels:

engraving work

A

150fc

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Q

Reference Illumination Levels:

drafting rooms

A

70fc

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Q

Reference Illumination Levels:

routine office work

A

50fc (reading/writing)