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Filaments
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Total cards: 3•Content version: v4•Public deck•Updated: 8/1/2026
Card preview (3)
#1
Front (Question)
What are the three types of automotive lightbulbs?
Back (Answer)
• halogen - tungsten filament • LED • xenon/high intensity discharge
#2
Front (Question)
How are halogen lightbulbs used as trace evidence?
Back (Answer)
• has a tungsten filament • tungsten is rigid and brittle at ambient temperatures and ductile at incandescent operating temperatures • oxidised when exposed to atmosphere at operating temp - microscopic analysis • glass can be fused to filament - SEM-EDX
#3
Front (Question)
How can you tell if the filament of a halogen lightbulb was off?
Back (Answer)
• off: no pronounced distortion • on: inertial force distortion on hot filament