H4-1 : single xenon bulb , only one is for low beam
H4-2 : 1 pc xenon bulb + 1 pc halogan bulb , xenon bulb is for high beam , halogan bulb is for low beam
H4-3 : bi-xenon bulbs , one is for low beam , the other is for high beam
H4-4 : single xenon bulb ,electromagnet system,adjust focus to change low and high beam |
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