1157 Switchback Dual-Color LED DRL Turn Signal Light Bulbs White/Amber

1157 Switchback LED Bulb Overview

Underground Lighting 1157 switchback LED bulbs combine the day-running light and turn signal functions in one dual-color bulb. The bulb produces white light during normal DRL or parking-light operation and changes to amber when the turn signal is activated.

Each bulb produces 1200 lumens using 54 SMD LEDs arranged for 360-degree coverage. The dual-color design uses 18 white LEDs at 6000K  color temperature and 36 amber LEDs with a 3500K rating, giving each lighting function its own dedicated LED output.

For shoppers comparing the best built-in resistor switchback 1157 LED bulbs, the real difference is the overall design, not a single specification. This bulb combines dual-color operation, a built-in turn-signal resistor, CANBUS compatibility, active cooling, and plug-and-play installation in one replacement bulb.

White DRL and Amber Turn Signal in One Bulb

The switchback function lets one bulb handle both the running light and turn signal without changing bulbs.

In normal running-light mode, it produces 6000K white light. When the turn signal is activated, it switches to 3500K amber. Once the signal cycle ends, it returns to white light.

This makes these white turn signal bulbs a practical choice for vehicles where the factory 1157 socket handles both functions.

Built-in Resistor for Turn Signal Operation

LED bulbs use less electrical current than traditional incandescent or halogen bulbs. On some vehicles, the CANbus system detects that difference as a bulb-out warning on the dashboard and also causes the turn signal to flash faster than normal.

This 1157 LED switchback has a built-in resistor on the turn signal circuit to handle the lower load of the LED. The resistor only works on the turn signal circuit, not the running-light circuit.

This helps prevent hyperflash without the need for a separate external resistor on compatible applications.

1200LM Output Wit 54 SMD LEDs h 360-Degree Coverage

Each bulb uses 54 SMD LEDs to produce 1200 lumens of output. The LEDs are distributed around the bulb to provide a 360-degree lighting pattern.

The white and amber LEDs are arranged to provide broad coverage within the factory housing rather than concentrating light in a single direction. This helps maintain consistent output as the bulb is viewed from different angles.

Intelligent Cooling for Resistor Heat

The built-in resistor generates heat when the turn signal function is active. To manage that heat, the bulb uses a full metal heatsink and a silent cooling fan.

The fan activates during turn signal operation, working with the metal heatsink to move heat away from the LED assembly while the resistor is active.

The cooling system is built into the bulb, so you don't need to install a separate fan or cooling component.

Super CANBUS for CK and Non-CK Sockets

The Super CANBUS electrical design supports both CK and non-CK sockets. The bulb does not require polarity matching (non-polar), making the installation fast and simple.

The combination of CANBUS compatibility and the built-in resistor addresses common electrical issues when replacing factory halogen bulbs with LEDs.

Installation

Difficulty Level: Beginner - Simple Installation for anyone.

Installation takes approximately 10 minutes. Remove the factory bulb and install the 1157 switchback LED into the compatible socket.

The plug-and-play design requires no cutting or complicated installation. The built-in resistor eliminates the need for a separate external resistor and leaves no signs of flickering or blinking in compatible applications.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Do you have questions about the application, installation, shipping, warranty, or more? Do not hesitate to reach out to Underground Lighting and talk to a specialist. Chat with us online by hitting the chat button or call us at (561) 918-5225. We are here to help!