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The lights sold are plug and play, them 15W fog lights are designed to cool in some way I'm sure. They would be good for running lights/just starting to get dark times, but I would think you wouldn't need that much light if your planning to use HID for dark lighting. Maybe look for some ~4w lights (4x 1w led) for cars just for the other people to see you factor + they would give a little light (about 30-35w comparable)
The only time current limiting or cooling is 100% needed is when you build it your self buying separate LEDs (2.5-4v normally each) not led bulbs rated for 12v and plug into car sockets, or the fog lights.
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