I've got one that used to be a hand held job that had a cigarette socket on the end, similar to this except without the grille 55w H3 on a switch, great for people who've got high beam or HID's behind you, and if they start flashing, slow down to make them overtake and do this to them
in the past ive used a cheap front fog light with the shield over the bulb pulled out.... you get the wide spread of the fog light lens without the vertical cut off caused by the shield over the bulb.