Difference between a 1157 and a 2057 bulb

If you’re replacing the bulbs in your automobile or motorcycle, you may come across the 1157 and 2057 bulbs. Turn signals, tail lights, and brake lights frequently use these bulbs. Despite having similar looks, they differ in ways that could impact performance. Selecting the appropriate bulb for your car will be made easier if you are aware of these variations.

difference between a 1157 and a 2057 bulb

What Are 1157 and 2057 Bulbs?

The 1157 and 2057 light bulbs are incandescent bulbs with two filaments. They are somewhat interchangeable because they fit into the same socket. The bulbs can be used for both running and braking lights thanks to their dual filaments.

1157 Bulb

A common bulb used in vehicle lighting is the 1157. Its base type is known as BAY15d. There is a difference in brightness between the two filaments. Brake lights use a brighter filament, and running lights use a dimmer filament. The 1157 lightbulb runs at:

The brake/turn signal filament requires 12.8 volts.
The tail/running light filament requires 14 volts.

2057 Bulb

The 2057 bulb is utilized in a similar manner and fits into the BAY15d base. It is intended to be more energy-efficient, though. The 2057 lightbulb runs at:

The brake/turn signal filament requires 12.8 volts.
The tail/running light filament requires 14 volts.
Notwithstanding these parallels, the 1157 and 2057 bulbs differ in power and light output.

Key Difference between a 1157 and a 2057 bulb

While both bulbs are similar, some key differences can influence your choice.

Wattage and Brightness

The primary difference between the 1157 and 2057 bulbs lies in their wattage and brightness.

1157 Bulb Wattage

Brake/turn signal filament: 27 watts
Tail/running light filament: 8.3 watts

2057 Bulb Wattage

Brake/turn signal filament: 26.9 watts
Tail/running light filament: 6.7 watts
The 1157 bulb has a higher wattage for the tail/running light, making it slightly brighter in that mode compared to the 2057 bulb.

Heat Emission

Higher wattage means the 1157 bulb emits more heat. This can be a consideration if your vehicle’s light housings are sensitive to heat.


The 2057 bulb frequently lasts longer because of its lower wattage. For drivers who want to cut down on the frequency of maintenance, this may be helpful.

Light Output

In the running light mode, the 1157 bulb typically has a higher brightness. Practically speaking, though, the change can be small and difficult to see without a side-by-side comparison.

Energy Efficiency

The 2057 lightbulb uses a little less electricity. When compared to automobiles with numerous lights or electrical accessories, it can be beneficial that the running light function consumes less electricity.

Difference between the 7506 and 1156 bulbs

Applications and Compatibility

Although both bulbs have comparable uses, knowing how best to use them can help you make the best decision.

Common Uses

  • 1157 Bulb: Often found on bikes, trailers, and vintage cars.
  • 2057 Bulb: The 2057 bulb is used in a common replacement in modern car models that strive for increased longevity and efficiency.


Since both bulbs fit the same BAY15d sockets, they can be switched out. But it’s important to take into account the vehicle’s specs and the intended performance (brightness vs. efficiency).

How to Choose the Right Bulb

Selecting between the 1157 and 2057 bulbs is contingent upon multiple criteria.

Vehicle Specifications

To find out whether a certain kind of bulb is advised, consult the handbook for your car. Safety and optimum performance are guaranteed when using the suggested lightbulb.

Desired Performance

Because of its higher wattage, the 1157 bulb can be a better option if brightness is your top priority. In terms of longevity and energy efficiency, the 2057 bulb is better.

Environment and Use

Think about the surroundings in which you drive. Better vision can be achieved with a brighter bulb (157), especially if you regularly drive in low-light conditions. For commuting in urban areas or infrequent usage, the 2057 could be adequate and energy-efficient.

Heat Sensitivity

The decreased heat output of the 2057 bulb may be able to prevent damage to light housings in your car.

Installation Tips

These bulbs are simple to install, but here are some pointers to make sure they work properly:

  • Safety first: To prevent burns, make sure the car is turned off and the lights are cool.
  • Clean Hands: To handle the bulbs, put on gloves or a clean towel. Your skin’s oils can cause the bulb to die sooner.
  • Secure Fit: To prevent flickering or malfunction, make sure the lightbulb is firmly inserted into the socket.
  • Test: Once installed, make sure the lights function in both dim and bright modes by conducting a test.


Having a clear understanding of the difference between the 1157 and 2057 bulbs will you in your decision-making. Each has advantages over the other; the 2057 offers more longevity and energy efficiency, while the 1157 offers brighter light. When selecting the correct lightbulb, take into account the features of your car, your driving requirements, and the environment in which you drive. Making the right decision can improve the lighting performance of your car and guarantee road safety.

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