Here’s a good idea and DIY on how to make an HID flashlight. It shouldn’t be too hard as all cars use 12V DC power so you just need to find a 12V battery for whatever car part you want to use.
Once or twice a year, my family and I go camping with some friends. Usually we show up at night and have to set up camp in the dark. This can get pretty frustrating using just regular flashlights and using car headlights is difficult to move around. So I came up with a way to make a HID flashlight that has become very useful for not only camping but is a great tool to keep in the car in case of emergencies (flat tires, etc).