Know about Dual-Beam and Single-Beam Headlight Bulbs for Your Car

SOME SPECIAL CASES

1. In rare cases, a single-beam bulb performs for both high and low beams in the headlight assembly. The reason is a movable housing or a mechanism that shifts the position of the light source, such as a shutter unit.
When the low beam is on, the shutter will block a portion of the single beam, allowing the headlights to project a portion of the light as the low beam. When the high beam is turned on, the shutter will open, allowing the single beam bulb to project more light and see farther, i.e., have a high beam function. For example, the H7, 9012 model bulb may be used in this case. 

2. We just mentioned that normal dual-beam headlights have only one pair of bulbs, one on the driver's side and another on the passenger's side. However, there are some models that require two pairs of dual beam bulbs to provide more light, such as the Ford F250. But this does not mean that one dual beam headlight bulb only works on the low beam or only on the high beam. When the low beam function is turned on, the low beam filaments in all four bulbs are energized and function as low beams.

After getting tired of dim halogen lights, most people will opt for brighter and more energy-efficient LED bulbs for vehicle lighting. It is important to note that when choosing LED bulbs, you also need to follow the principle of single-beam and dual-beam headlight bulbs.

Although LED lights are a different technology than halogen lights, that doesn't mean they do not play by the same rules. With a single beam halogen bulb, we still need a single beam LED. With a dual-beam halogen bulb, we still need a dual-beam LED.

If you try to save money by buying a dual beam bulb for your single beam headlight system, it simply will not work.

Then maybe a customer will say, "I'm sure there is a single beam bulb, I just need to choose a single beam LED headlight bulb."

No, that is not how that works. Each assembly has its own specific bulb size and headlight mechanism. Before replacing a bulb, you have to find out what bulb model is used in your vehicle. This is because each model of bulb differs not only from a single beam to a dual beam but also from a connector and a chuck.

If you want to know which bulbs fit your vehicle, you can look up the model owner's manual or use the AUXITO Bulb Finder.

However, this method does not apply if you have replaced the headlight assembly or modified your car. In this case, you can further check the headlight bulb model of the headlight assembly for confirmation.

H11, 9005, 9006, 9012, H7, H1, and H3 are single-beam bulbs that have only one filament and emit only one beam of light.

H4, H13, 9004, and 9007 are dual beam bulbs with two filaments and can be used as both high beams and low beams.

No. Different bulb models have different connectors and chucks, so you cannot install LED dual-beam bulbs in a single-beam headlight assembly. And single-beam headlight systems cannot handle dual-beam bulb operation.

LED bulbs with better lighting technology than halogen bulbs, provides you with brighter, more energy-efficient lighting through LED chip technology. But they follow the same rules, i.e., the original halogen lamp is a single beam, then the LED bulb is also a single beam.

No. Generally speaking, fog light bulbs are positioned low and only need to emit a single beam of light to improve illumination during inclement weather. Unlike headlights, you do not need to switch between high and low beams in different road conditions.