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3157 CK LED Bulb - Dual Function 18 SMD Tower - Wedge Retrofit

Part Number: 3157-x18-T-CK-RVB
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Starting at $4.88 ea. (per Bulb)
Volume price as low as $4.39
Orders Ship Today!  5 Hours and 31 Minutes remaining
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CK-wired LED replacement bulbs can fit SRCK- and SACK-compatible boat and RV applications such as navigation lights, cabin lights, dome lights, tail lights, brake lights, reverse lights, turn signals or side marker lights. This 3157 dual-contact, dual-function bulb has 18 LEDs (5050 SMD) that create a 360° viewing angle for better, allover light emission with reduced hot spots. Produces 70 lumens. Tower-style design with a 16-mm wedge base for easy plug-and-play installation. The energy-efficient bulb operates within a wide 9-14.8V DC range and is designed to last 30,000 hours on your motorhome or boat—25 times longer than incandescents. CK bulbs contain both grounds on the same side of the wedge. Use a ground tester or contact your dealer to see if your vehicle has CK light sockets. Available in amber and red. Not sold in pairs. Price per bulb.

Important Notes - Please read before purchasing:
  1. Your vehicle may require an LED compatible Flasher or Load Resistor. LED brake/tail lamps will not flash with most stock flasher units due to their extremely low current draw. Try our Vehicle LED Bulb Finder to find a compatible flasher for your vehicle. Please See More LED Car Bulb Notes
  2. For best results the LED color should be the same as the lens color. If bulb is behind a clear lens, use the appropriate color for turn and brake light functions. Please See More LED Car Bulb Notes
  3. If your daytime running light application serves multiple purposes, this bulb will most likely not work for your vehicle.
  4. To protect LEDs in marine applications, it is advisable to use a 12 VDC line conditioner to compensate for voltage irregularities common in marine low-voltage systems.
3 Years
Super Bright LEDs, Inc. offers a 3-year warranty to protect against manufacturer defects and malfunctions. If you experience failure of an LED or other component not caused by negligence, abuse, unauthorized repair or disassembly, we will replace the product within the warranty period. If the same product is no longer available, a product of equal value may be substituted. Read More
In order for certain products within controlled categories, such as electrical and electronic devices, to be legally sold in the European Economic Area, they must bear a CE label, which stands for Conformité Européenne (European Conformity). Products with this label meet environmental, health, and safety standards put into place by European legislation.
  • Turn Lights
  • Side Marker Lights
  • Tail Lights
  • Reverse Lights
  • Brake Lights


Swipe left to see additional specifications
Part NOCCT / Wavelength
Current Draw @ Operating Voltage
Price Ea.Product WeightConstant Current
-3157-R18-T-CK-30/110 lm0.15A(Discontinued)--
-3157-A18-T-CK-35/120 lm0.16A$4.88--
-3157-R18-T-CK-2PK-30/110 lm0.15A(Discontinued)--
-3157-A18-T-CK-2PK-35/120 lm0.16A$9.76--
Single VS Dual VS CK Dual Filament
Single Filament, Dual Filament, and CK Dual Filament
  • When looking for a replacement bulb, the way the socket is wired determines the part number of the replacement bulb. Sockets that are used for a single intensity call for 3156 or 7440 bulbs (single filament), while sockets that have a dual intensity call for 3157 or 7443 bulbs (dual filament). Dual filament bulbs will function properly in a single intensity socket. So a 3157 bulb will work in a 3156 socket and a 7443 will work in a 7440 socket. However, single filament bulbs will not function in a dual intensity socket. CK indicates where the socket's positive and negative terminals are located. CK LED bulbs are very versatile and can be used in any application a CK or non-CK bulb is used.
3157-x18-T-CK - 3157-CK LED Bulb - Dual Intensity 18 SMD Tower
3157-CK LED Bulb - Dual Intensity 18 SMD Tower



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Technical Level
Part Number
Reviewed On

THE lamp for Polaris RZR

These lamps are THE plug-and-play solution for the 2012/13/14 Polaris RZR tail lamps. They are brighter than stock at both brightness levels. Couldn't be more pleased with them.

Tried others from other vendors, and they wither didn't work, or didn't work AND blew fuses. These are the ones... don't waste time or money on others.

3157-R18-T-K on LEFT side, stock lamp on RIGHT side

Helpful? Yes (3) No (0)

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Part Number
Reviewed On

Great Lights

The LEDs work great. They were purchased to replace the rear taillight bulbs in my Polaris RZR that would get way to hot. These new LED have no heat.

Helpful? Yes (3) No (0)

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Reviewed On

Great Light at a great price

Maybe I did not read into these LED lights enough or what the lowest brightness value must be for a vehicle brake light. But I do not recommend this for your Daily Driver brake light. I did not feel that these are bright enough that other motorist can clearly see you are braking.

Helpful? Yes (0) No (0)

Danno 512
Technical Level
Part Number
Reviewed On

2012 Polaris Sportsman's use CK Bulbs!!!

I'm the owner of a 2012 Polaris Sportsman 850 Touring model and wanted to switch to LED tail lights. I originally emailed customer service and at their suggestions purchased a set of more expensive bulbs. I got them and they immediately blew my 20 amp fuse. I then again contacted customer service and was told I needed CK bulbs for my bike and were sent another set. I installed the CK bulbs and they work great. To be honest I can't tell they're any brighter then the standard bulbs.

Helpful? Yes (0) No (0)

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Bright when bright, bright when dim

I bought these in red, for use in the brake lights in my Chevy Trailblazer. It takes CK bulbs, four of them.
Dual mode bulbs have a "dim" mode and a "bright" mode. In bright mode, these are SUPER bright. Brighter than even factory incandescents. They look real nice. Unfortunately, "dim" more is also super bright. The difference between brakes no and no brakes on is too subtle. It looks like you're driving around with your brake lights on all the time. It's a shame too because usually the problem with LED bulbs is that they aren't bright enough. If only you could dial back the brightness of the dim mode, these would be great. They are rated 30lm dim, 110lm bright. That seems very unlikely given how little difference there is between the two modes. Nice as these lights are, I wouldn't buy them again given the too-bright-dim-mode.

Helpful? Yes (0) No (0)

Response from Super Bright LEDs:

1157 LED bulbs are designed so that one contact operates the less bright tail light and the other contact operates he turn and stop light portion which is brighter. If the socket wiring is reversed, the brighter turn signal will be on when the tail light are on and less bright tail light will be then operated by the turn signal circuit and therefore, not be as visible. Since the 1157 is only able to be installed one way, the only solution is to switch the wires that control the tail and turn signal.

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