The light output with the H7 systems is higher than with the H4 ones because the two lamps work together. However, H7 systems have a higher lifetime cost factor over time because they need four bulbs instead of two, and both sides of the bulb should be replaced at the same time due to their similar lifespans.
h4 headlight bulb
It used to be standard on cars to have an h4 headlight bulb. These are called bi lux lamps. They have two filaments: one for the low beam and one for the high beam.
The following features identify an h4 headlight bulb:
• The housing of the lamp contains two filaments.
• The headlamp comes with only one lamp base plate.
h7 headlight bulb
The h7 headlight bulb is further improved over the H4 lamp, but only one filament is used because its construction is fundamentally different. Therefore, the vehicle needs two lamps per headlamp.
The following features identify an h7 headlight bulb:
• The lamp's bulb housing has a single filament.
• The headlamp comes with two lamp base plates.
Those who think it is good to put an H4 adapter on an H7 bulb would do themselves no favors since the light source would perform poorly. Moreover, such a makeshift fix voids the back light's license, thereby invalidating the vehicle's license.
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