OK so i bought lights for my 83 G20 chevy van, I have 4 headlight system I only bought 2 lights for the top (they will be high and low beams), my first install was a fail! The lights came on and after a few minutes, they would start to flash or go out.. BOTTOM LINE, I had 2 wires backward in my plug, Brown and green wires were in wrong spot.. after i corrected this WOW! Bright lights I actually enjoy driving at night and can see at NIGHT when driving!, SO i have 2 upgraded leds for the top set and running stock (they are dimmer lights) on the bottom.. Nilight is a VERY good brand and they stand behind their products! will buy again! I will eventually replace my bottom lights also..