PIAA Xtreme Force 4700K H4 Headlight Bulbs They emit a stunning, high output, cool blue white light beam. H4 - 55W/60W = 110W/130W Special Feature: A blue colored top coat that reflects a brilliant blue color even when the lamp is off Xtreme Force is a high efficiency bulb design with 20% more blue color than Xtreme White These bulbs utilize original lighting electronic and it won't damage any part of your lighting syst