Posts tagged ‘headlight’

Why do Some Cars Have Blue Headlights?

Traditionally, cars have had yellowish headlights. Now, many cars have light blue colored headlights. Some cars come with those headlights from the factory and other times, owners will install similar systems or similar looking systems.

The factory blue headlights are known as HID (high intensity discharge) headlights. Just like the name describes, they’re brighter than normal halogen headlights.

Traditional lights heat a small metal filament to produce light while HID lights create a plasma discharge arc between two tungsten electrodes. It is this plasma discharge that creates the blue color. But, this technology is not new, it’s very similar to the bright lights that illuminate stadiums and roadways.

The brightness is the main advantage of these lights. Like rear fog lights, these headlights were popularized in Europe where fog, rain and curvy roads create demanding driving conditions. Because HID lights are brighter, they penetrate fog, rain and snow better than halogen lights — an advantage when the conditions are not ideal.

HID headlights are also more energy efficient than halogens, which isn’t a major concern in vehicles right now, but as we move to battery powered cars that will become very important — the less power accessories consume, the further the vehicle can drive on a single charge. (more…)

April 2, 2010 at 12:46 am 12 comments


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