There are some people who like to use Halogen lights on their vehecles. I used to live in the mountains of Sakesar. We used to install Halogens on Jeeps for clear view. because we hade move through forest. Our PAF Police also used to install them on their jeeps and other locations.
Internet is the place to buy things nowadays. 1000bulbs.com is offering halogen lamp for sale. Brand like Plusrite 3202 offfers good light.