Some people asked me what is the difference between h7 and h11. Ok, look carefully.

H1:      single filament and single holder,  high beam light

 H1 light 

H3:  used more often on Japan branded cars

H3 light

H4: double filament and three holders, both low and high beam light are in one bulb

H4 light

H7: single filament and double holders, low beam light

H7 light

(sometimes, h1 and h7 are also used for fog light )

H11: used for fog light

H11 light

For more halogen light information, you can refer to:  http://www.sourcingmap.com/car_light.php

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