Xenon lamps well known in car headlights but i do not see them in use in streetlighting or other aplications. Why?

The Xenon lamps you are probably thinking of in car headlights are HID metal halide lamps, actually, but they use Xenon for starting plus a special ballast & instant-restrike ignitor to minimize the warm up time (you will notice they are a mercury vapor blue color for a few seconds just after being turned on). (I used to think they were pure Xenon arc lamps until I read otherwise).

There'd be no advantage to using this setup for streetlighting, where the warmup time of a standard (argon filled) metal halide lamp is not a problem and it will last longer (up to 20,000 hrs vs about 2000 I think for the car headlight). Now, for indoor household lighting  - I wouldn't mind having some but I doubt they will ever exist because of the high cost, short life and high-voltage hazard.

There also are Xenon-filled incandescents (too inefficent for streetlighting) and Xenon short-arc lamps (also too inefficent for streetlighting use, but they are used for high power search lights).

I do agree that the white color of vaporized Xenon does make a nice light though.

Thanks for the information