Light (Leaving Cert Construction Studies): Flashcards

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Measuring Light
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Unit measuring power consumption

Watt

Unit measuring total visible light emitted by source

Lumen

Unit measuring light reaching/illuminating a surface

Lux

Device for measuring illumination levels at locations

Lux meter

Standard overcast sky lux value

5000 lux

Degree of efficiency method formula

Li=Lo×WF×E×WAFAL_i = L_o \times WF \times E \times \frac{WA}{FA}

LoL_o in degree of efficiency formula

Available outdoor light (5000 lux for overcast sky)

Typical WF (window factor) value

0.5

Typical E (efficiency coefficient) value

0.4

Working plane height for light measurements

0.8-1.0 metres from floor

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