The primary difference between 3157 and 3157KX bulbs lies in their brightness and application. The 3157KX is typically a higher-output version of the standard 3157 bulb, designed to provide increased light output and enhanced visibility. Both bulbs have the same base and fitment, but the 3157KX is often used in situations where brighter lighting is needed, such as in brake lights or turn signals. Always check compatibility with your vehicle before replacing bulbs.
The 3157 is a clear bulb and the 3157NA is an amber color.
The 1157 has a 15mm metal bayonet (push/twist) cap, while the 3157 has a plastic wedge (push-in) cap.
The 4114 is an ultralong-life bulb with its major and minor filaments rated at 14v. The 3157 has its major filament rated at 12.8v and a much shorter lifespan. 4157 is in between the two bulbs for lifespan rating. All three bulbs produce the same amounts of light.
The main difference between the 3157 KX and 3157 NA bulbs lies in their design and intended use. The 3157 KX is typically a dual-filament bulb, often used for brake lights and turn signals, while the 3157 NA is usually a single-filament bulb, primarily designed for parking lights or tail lights. Additionally, the color temperature and brightness might vary slightly between the two, affecting their visibility and performance in different applications. Always check the specific vehicle requirements to ensure compatibility.
4057k is a ford number, while 3157 is a napa brand of the same item.
I have successfully installed bulbs 3057, 3157 and 3457 in my Chrysler Town & Country mini-van, for the brake/stop lights.
The 3157 and 4157 produce the same amounts of light from their dim and their bright filaments. The 4157 has a longer life rating than the 3157.
*157 is a double filament. a *057 is a single.
3157
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A 3157LL means 3157 Long Life, some stores carry it as 3357 bulb or a Heavy Duty 3157.the filament is stronger in the LL bulb.
For all practical purposes, they are interchangeable. To my eye the 3357 seeems to be brighter on the heavier filament. (brake/turn)