LED HEADLIGHT BULB H4 Cyclops Ultra 10.0 Bright LED12V 38W H4 ULTRA Bright LED Bulb High Low Beam The Cyclops H4 Bulb Do not be fooled by the imitators! There is a reason you hear so much about Cyclops LED products. Cyclops LED headlight bulbs are now available in the original version or the Ultra version. Our original H4 bulbs use the front two emitters for low beam and then switches to the rear two emitters for high beam. The Ultra uses the front two emitters for low beam and then runs all 4