This DIY LED Car Headlights will go through the steps I am going through in the making of homemade fog lights for my car, a Hyundai Atos. At first phase completion, my first 78 LEDs are dissipating 5.8 watts while my resistors only dissipate 0.85 watts, and the array is already powerful enough to dwarf the two front marker lights, which draw 3 watts each. My final objective is installing, at the very least, 300 LEDs at a total energy expenditure of 21 watts at the LEDs and 3.2 watts at the resistors.

[ Source : instructables ]