4. The width of the light strip is about the width of the area it will sit on (about half an inch/ 1 cm). some extra tips: before you place your light strip in your headlight, paint it silver or some darker color. The light strip I bought was white, (with super white lights), so I covered each LED with a super small piece of masking tape and painted it. Then i removed the masking tape, attached the wires to my battery to make sure they still worked and shined brightly... The light strip also has a 3m sticky back side which will also help make it stick to the clearance strip area.