7440/7443 LED Bulbs – Brake Lights, Switchback Bulbs

The Difference Between 7440 and 7443 Bulbs

Besides being somewhat similar numbers, how do 7440 and 7443 bulbs differ in terms of design, capabilities, and compatibility?

Just because the names of these bulbs are similar, doesn’t mean that they are totally interchangeable.

They are both turn signal bulbs, however, 7440s are single filament bulbs, and 7443s are dual filament.

Another key difference between 7440s and 7443s are that they are used in completely different parts of your car or truck.

Typically, 7440s are used in the back of your car to power rear turn signal lights.

Conversely, 7443s are used in the front of your car, powering front turn signal lights.

Which One Should I Buy: 7440 or 7443?

The first question you should ask yourself when debating between purchasing 7440s or 7443s is what purpose you’re looking to serve.

If you’re in the market for either a signal filament or dual and are not sure which to buy. Check your OEM bulb to confirm.

7443 will work for 7440 as a signal filament but a 7440 cannot work for a 7443 dual filament.

What is a 7440-bulb used for?

As forementioned, 7440 is for signal filament such as turn signal, or back up light.

What is a 7443-bulb used for?

7443 is for dual filament like Parking and Turn signal or Brake and Turn Signal.

Are 7443 and 3157 bulbs interchangeable?

While they are not exactly the same, 7443s and 3157 bulb models are in close competition with one another.
The main difference between the two is the size—the 7443 bulb is slightly larger.
Both the 3157 model and the USA-designed 7443 Switchback LED Bulb offer a stellar choice for direct turn signal replacement bulbs
They also both offer white/amber light filaments, as well as protection against hyper-flashing and error codes.
The 7443 also comes complete with a built-in resistor on the turn signal filament, as opposed to both the white and amber light filaments.
- This added protection against overheating is very valuable.
As with the 3157, the 7443 features dual-colored LED lights with 360-degree output for that coveted “best in class brightness.”
This model, like the 3157, also offers easy, “plug and play” installation for additional time-saving benefits.
- No additional resistors are needed, adding to the benefit of this bulb model.

What size are 7440 bulbs?

Size is a factor when you’re trying to establish compatibility between different types of turn signal bulbs and your car or truck’s make and model.
7440 single filament bulbs are typically 25 watts and used as rear turn signal lights as well as reverse lights, depending on the vehicle.
They cannot be placed into a 7443-bulb socket; however, a 7443-replacement bulb can often be placed successfully into a 7440 socket.

How many lumens does a car brake light have?

The amount of light output from a car’s rear brake lights depends on the particular car or truck in question.
Typically, rear brake lights are between 5 and 100 lumens.
By comparison, front car lights range anywhere from 10 to thousands of lumens. That’s quite a difference!
To illustrate the difference, consider this—on a clear night, a full moon is approximately 1 lumen. This gives you a visual example of the power of car brake lights’ lumens.

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To find more questions and answers, please visit our FAQ Page.

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