The most commonly used bulb models in car lights
Common car bulb models mainly include two categories: H series and D series. Here are some specific models and their applications:
H series bulbs
H series bulbs are one of the most common types of car bulbs, mainly used for halogen bulbs, and they have different models for different parts of the car:
H1: single filament single foot, mostly used for high beam.
H3: special type, generally used for fog lights or auxiliary lights, common in Japanese cars.
H4: double filament three feet, one bulb has low beam and high beam, widely used in headlights.
H7: single filament double feet, mainly used for low beam.
H11: used for fog lights or other auxiliary lighting.
In addition, there are some other models such as H8, H9, H10, etc., which also have their own application scenarios.
D series bulbs
D series bulbs usually refer to xenon lamps (HID), which have different models:
D1S/D1R: used for lens-type xenon lamps.
D2S/D2R: also used for lens-type xenon lamps.
D3S/D3R: mercury-free, used for lens-type xenon lamps.
D4S/D4R: Mercury-free, used in lens-type xenon lamps for some premium vehicles.
Other bulbs
In addition to the two main series mentioned above, there are some other types of bulbs used in specific areas of the car:
Turn bulbs: such as PY21W.
Position lights: Common models are W5W, H9, H10, H11, H12, etc.
Rear lights: Common models are P21W, P21/5W, etc.
Base shape
The base shape of the bulb is also an important distinguishing point. Common base shapes include:
Round: Usually has two or three contacts.
Oval.
Rectangular: Usually has only one contact.
When purchasing and replacing bulbs, be sure to check the specific model and base shape of the bulb to ensure that the newly purchased bulb matches the original car. In addition, for some special designs, such as some bulbs with starters or reflective bowls, special attention should also be paid.
The above are some common car bulb models and their basic uses. In actual applications, there may be more models and variations, depending on the design requirements of the car manufacturer.
