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 a surface area

Lux

Device for measuring illumination levels

Lux meter

Standard overcast sky lux value

5000 lux

Typical window factor (WF) value

0.5

Typical efficiency coefficient (E) value

0.4

Working plane height for lux measurements

0.8-1.0 metres from floor

Formula relating lux, lumens, and area

Lux=LumensArea (m2)\text{Lux} = \frac{\text{Lumens}}{\text{Area (m}^2\text{)}}

Degree of efficiency formula

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

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