Artificial Lighting (Leaving Cert Construction Studies): Flashcards

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Artificial Lighting
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Incandescence

Light produced when object becomes so hot it glows

Luminescence

Light from chemical/electrical reactions, not heat

GLS lamp filament material

Tungsten metal

% of GLS energy that becomes heat

90%

Gases in halogen lamps

Iodine or bromine

LED lifespan (hours)

Up to 100,000 hours

Fluorescent efficiency vs tungsten (times more)

rac{100}{25} = 4 times more efficient

Luminaire

Complete lighting unit: lamp, socket, wiring, reflector

Energy efficiency measurement for lamps

Lumens per watt

Halogen lamp hazard

Extremely hot, fire and burn risk

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