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Halogen is the type of bulb technology - changes the gas & glass so that "stuff" that boils off the filament re-condenses back onto it most of the time - hence can have hotter filament (brighter/whiter) and no "gone dim from silver inside" problems.

Easyish to tell if bulb is halogen:
- will usually be cylindrical (gas is under pressure)
- will be lots of warnings to not touch glass with fingers - (fingerprints can etch/distort the glass at high operating temps & cause ...