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I was reading a discussion about different HID lamps and I was wondering why would you use HID lamps in the first place?
Is it for fuel/energy efficiency?
Is it for their higher brightness?
Color of light?

They cost quit a bit!

EDIT: To make it clear, I don't see why one would spend that much money to replace their headlights with HID lights. I want to know what people usually want to achieve when they do this. Do they want to have brighter more focused lights? or they want to conserve fuel/energy and improve their MPG? or they just want to be cool?
In my opinion this is not an open ended discussion.

Ali
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From Wikipedia:

High-intensity discharge (HID) lamps make more visible light per unit of electric power consumed than fluorescent and incandescent lamps since a greater proportion of their radiation is visible light in contrast to heat.

Bob Cross
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