I have them soldered to the stock headlight wires. Nothing else, using stock switch, low or high they come on. Bright white light. But not sure if I'm gonna like them. 30 degree spot beam 27 watts each. Doesnt seem to light out far, and not wide around the quad in front. I'm gonna get it in the barn today where its dark and try to get em aligned better, I was loaded last night. Then maybe hook the stockers back up so I have a good sober (hopefully) comparison. I have some blue 'brighter' bulbs in my stockers that seemed way better than stock bulbs. Is there a resistor in the stock light switch?