How do the blue-ish headlights on expensive luxury cars work?

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Blue-ish headlights are not very common yet, but they are likely to become the norm because they produce more light than normal headlights while at the same time using less power. This combination is hard to beat! All of these technologies excite atoms so that they produce photons.

from Pocket http://auto.howstuffworks.com/question387.htm
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