fog lamps don't have hi/low features. It might have an H4 backing but they power the same bulbs. I have LED's in mine and basically, one of the tines on the H4 is a ground, the second tine powers up some of the LED's, the third tine powers up more but different LED's... when I hit passing light, all LED's light up. The pictures shown by Vivo have the correct backing (H4) but those type are usually on or off, good for turn signals, or if they are bright enough, fog lights.