4157 vs 3157: Bulbs Comparison

The lighting system of your auto is very important and there are a lot of options to choose from. If you are looking at upgrading or changing your system, then you may be wondering what the difference is between 4157 and 3157 bulbs.

We found that 3157 and 4157 bulbs are interchangeable after testing a number of different options. That is because these two bulbs have the same dimensions. The only difference is that 4157 bulbs have a higher power output than 3157 bulbs.

Here is a quick comparison of the two types of bulbs to help you make a decision.

Socket Compatibility

The 3157 models are compatible with the following: 3157, 3157A, 3057, 3057A, 3457, 3457A, 4057 and 4157. As you can see, the 4157 model may be a good solution if you are looking for a more versatile option.

Socket compatibility is a pretty important aspect when we speak of the two types of bulbs. Usually, two bulbs are compatible if they have the same dimensions. So, when you want to interchange one for the other, all you have to do is remove the old bulb and screw in the new one. Also, the dimensions of the lamp you are using will define the maximum power output it can take. Thus, you can use a 100W bulb in a socket that is meant for 60W only if you don’t mind damaging the socket.

The 3157 Lamp Features

The 3157 or P27/7W bulbs are the most popular size for turn signal and brake light applications. The lamp has a single filament, but the unique design of the socket allows two different functions with one bulb - brake/turn and tail light.

They have the W2.5×16q cap that usually has two filaments - one for low beam and one for high beam. Lamps with 2 filaments are not used as a turn signal or brake light because of the different light output. Moreover, the light emitted by the brake/turn and tail functions is Amber in color, while the headlights are white.

A nominal power of 12 V: 27 / 7 W describes this bulb as a single-filament 27-watt bulb that will draw 7 watts on a 12 volt system. This characterizes the 3157 bulb as a dual-function bulb - brake/turn and tail light.

Usually, cars that use such bulbs are equipped with a separate filament for each function. The brake and turn signals use the brighter 27-watt filament, while the 7-watt filament is used for the tail lights.

The benefits of using this lamp:

• The 3157 is a very versatile bulb that can be used for both turn signals and brake lights, as well as tail lights.
• The bulb is very bright, making it ideal for use as a turn signal or brake light.
• The unique design of the socket allows two different functions with one bulb - brake/turn and tail light.

The disadvantages of using this lamp:

• The bulb is not available in a clear or smoked lens, so it cannot be used as a backup light.
• The 3157 is not legal for use in all states. Some states require that turn signals and brake lights be separate bulbs.

The 4157 Bulb Specs

Not only do these bulbs have a longer lifespan than traditional lightbulbs, but they can also withstand more wear and tear! These are the ideal choice for your car or truck's interior or exterior lighting needs.

The 4157 lamp has ‎a base W2 5x16d, a voltage of 12V, and a wattage of 28.54W. Such nominal power describes the bulb as a dual-function one-turn signal and brake light. The dimensions of the 4157 are 2.5 inches in width and 16mm in length.

This model has two filaments: one for the low beam and one for the high beam. The light emitted by the brake/turn and tail functions are amber in color, while the headlights are white.

The benefits of using this lamp:

• The color temperature of this bulb is very close to natural sunlight, making it easier on the eyes.
• The 4157 has a very long lifespan, making it a great investment.
• The bulb is used for both turn signals and brake lights, as well as tail lights.

The disadvantages of using this lamp:

• The light is really bright, which can be a disadvantage if you are looking for a more subtle look.
• The 4157 is not available in a clear or smoked lens, so it cannot be used as a backup light.

Features Comparison

Specs	4157 bulb	3157 bulb
Base	W2.5×16q	W2.5×16q
Number of filaments	2	3
Applications	Backup light, brake light, turn signal light	Backup light, brake light, turn signal light
Nominal Power	12 V: 35 W	12 V: 27 / 7 W
Cross Compatibility	3157, 3157ST, 3057X, 4057K, 3457NAK, 3155LL, 3457ALL, 4157LL, 3157NAK, 3157AK, 3157NALL, 3047K, 3757ALL, 3157KX, 3057ST, 5702AK	3155, 3457A, 3457NA, 4057,4157, 3157A, 3057A, 3157, 3157NA, 5702A, 4157NA, 3057, 3454NA, 4157, 3047, 3357A, 3757A, 3457, 4114, 3357, 4114LL, 3457K, 3157LL, 4157K, 3057LL, 4157NAK, 3357LL, 4057LL, 3157K, 3357K, 3057K, 3057ALL, 3457AK, 3357ALL, 4114K, 3157X, 3057KLCP, 3757AK, 3047LL, 3057KX

Usability

4157 bulbs are easier to use than 3157 bulbs. They have a lower profile and are less likely to get in the way when you are working on your car. They are also easier to install and remove. Usually, the 4157 lamps are used for the turn signals and the stop lights, while the 3157 are used for the tail lights. The 4157 bulb is a newer design that, compared to the 3157, lasts longer and has nominally higher brightness output. We've tested most of the options out there for both types of bulbs, so we can help you make a more informed decision about your purchase.

Nominal power

When it comes to the 4157 vs 3157 comparison, the 4157 bulbs have a slightly higher power output. This is because they have a more efficient design that allows them to draw less power from your car’s electrical system. The 3157 bulbs are weaker, only rated for 27 watts, whereas the 4157 bulbs are marginally stronger at 29 watts. With such nominal power, it would be hard to notice a difference in performance between the two types of bulbs.

Technology used

The 4157 lamp uses Krypton gas in the bulb, while the 3157 lamp doesn`t. They also have different numbers of filaments. The 4157 has two and the 3157 has three. Krypton gas in the bulb allows for a brighter light, but it also makes the bulb more expensive to produce. The three filaments in the 3157 bulbs make them better at dissipating heat, which gives them a longer lifespan than the 4157 bulbs.

Brightness level

Generally speaking, in this aspect they don`t differ much. The light output of both bulbs is pretty much the same. However, the 4157 bulbs have a higher intensity and thus appear brighter to the naked eye. If you are looking for a bulb that will give you a little bit more light, then the 4157 is the way to go.

Color temperature

The 3157 bulb color temperature is usually about 3000K and it is good when used in fog lights. The 4157 bulb has a color temperature of 600K, which is why it is often used as a headlight bulb. Also, such a characteristic makes it great for use in projector headlights. Moreover, the 4157 bulb has a whiter light that is closer to natural sunlight, making it easier on the eyes.

Replacement

We found that 3157 and 4157 bulbs were interchangeable after testing a number of options. They have the same bulb base, albeit made from slightly different materials. The connectors are also shaped identically.

Drivers must know that two lamps are interchangeable only in case they don’t have any additional functionality. For example, some 4157 bulbs are equipped with a built-in circuit, which can't be found in 3157 bulbs. Their socket type and size are the same, but the 4157 is a bit longer. The bottom line is that if you need to replace a 3157 bulb with a 4157, it’s not a problem.

4157 vs 3157 - which is better?

So, what is the overall conclusion of the 4157 vs 3157 comparisons? The 4157 bulbs are better than the 3157 bulbs in terms of power, brightness, and color temperature. They are also easier to use and replace. However, they are not always the best choice for your car. It all depends on what you need and what your car is equipped with. If you are unsure, then it is always best to consult with a professional to find the right bulb for your needs.

The main selling point for 4157 bulbs is their increased lifespan in comparison to 3157 bulbs. These bulbs will last four times as long, meaning you won't have to frequently replace them. Additionally, they provide the same if not better performance than 3157 bulbs. Consequently, 4157 bulbs are the best value for your money.

However, at the same time, the 3157 lamps still may be used when the 4157 is not an option. The main thing is to know the difference and make sure that the chosen bulb meets all the requirements. Moreover, these bulbs would be a perfect solution for those who are on a budget or simply don't need anything too fancy.

The installment process of both types is the same. For the most part, they are a direct replacement for each other. The process is very simple. First, take out the old bulb and insert the new one. Make sure it's in all the way and then screw it in place. Once it's tight, you can put the cover back on and turn on your car to test the new bulb.

To sum up, the 4157 vs 3157 comparison showed that the 4157 bulbs are better in terms of power, brightness, and color temperature. They are also easier to use and replace. However, they are not always the best choice for your car. It all depends on what you need and what your car is equipped with. If you are unsure, then it is always best to consult with a professional to find the right bulb for your needs.

Final words

Whenever thinking of 4157 vs 3157, it is essential to know that the 4157 bulbs are better in terms of power, brightness, and color temperature. They are also easier to use and replace. However, they are not always the best choice for your car. It all depends on what you need and what your car is equipped with. If you are unsure, then it is always best to consult with a professional to find the right bulb for your needs.