Artificial Lighting (Leaving Cert Construction Studies): Flashcards

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Artificial Lighting
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Two principles of artificial lighting

Incandescence and luminescence

% of GLS lamp energy wasted as heat

90%

Gases in halogen lamps

Iodine or bromine

Coating inside fluorescent tubes

Phosphor

LED lifespan (hours)

100,000 hours

Fluorescent efficiency vs tungsten (x times)

4 times more efficient

Unit measuring lamp energy efficiency

Lumens per watt

GLS lamp life expectancy (hours)

1,000-2,000 hours

Complete lighting unit housing lamp

Luminaire

Main hazard of halogen lamps

High temperature (fire/burn hazard)

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