While H1, H3, and H7 bulbs all have just one filament, the H4 is a dual-filament bulb. Instead of only one wire producing light, the H4 bulb has two. This allows the H4 bulb to serve as both the main beam and dipped beam headlights in one single bulb.
Port of shipping
India
Mumbai Port, Mundra Port, New Delhi Port, Nhava Sheva Port
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