iBrightstar Switchback Projector LED Bulbs 3157/4157/3155/3457 White & Amber — Dual-Color DRL and Turn Signal, High Brightness

iBrightstar Switchback LED bulbs deliver crisp xenon-white daytime running light and bright amber turn signals in one plug-and-play unit.

These dual-color, projector-style LED bulbs replace common 3157-family sockets to give vehicles a modern DRL/parking light appearance while switching cleanly to amber for signaling. Built with a high-density SMD array, full aluminum housing and a focused projection lens, the lamps balance brightness, heat control and long runtime for everyday driving on 12V and 24V systems.

How bright are these bulbs compared with standard halogens?

The iBrightstar units use 72 SMD 3014 chips plus 4 SMD 3030 chips per bulb for a high lumen output while keeping power draw low. The projection lens concentrates light for a sharper beam and better perceived intensity on the road.

• Over 300% brighter than many stock halogen bulbs in perceived output.
• White mode: 3.5W per bulb; Amber mode: 4W per bulb.
• Projection lens improves forward light distribution and visibility.

Will these fit my vehicle and how do I install them?

They are designed to fit a wide range of 3157-family sockets including 3157, 4157, 3155, 3457 and many compatible variants. Installation is simple plug-and-play for most applications, but always confirm socket type and clearance before ordering.

• Compatible sockets: 3157, 3157A, 3057, 3155, 3357, 3457, 4057, 4114, 4157, etc.
• Working voltage: 9–24V (suitable for 12V and 24V systems).
• Check bulb length and base clearance to ensure a proper fit.

Do I need additional parts to prevent hyper-flashing or warnings?

Because LEDs draw far less current than incandescent bulbs, some vehicles will detect the lower load and either hyper-flash the turn signal or show a dashboard warning. Adding a 50W 6‑ohm load resistor or an LED-compatible flasher relay resolves most of these issues and stabilizes flash rate.

• Common fix: one 50W 6Ω load resistor per circuit or an LED flasher relay.
• Resistor prevents hyper-flash and false bulb-out warnings on many cars.
• Professional installation recommended for wiring and resistor placement.

How durable are these LEDs and what are their thermal features?

Each bulb combines an aluminum housing and a built-in constant-current IC to manage heat and stabilize output, which helps extend service life. With proper installation and vehicle ventilation, these bulbs are rated for long operational life under normal driving conditions.

• Rated service life: up to 30,000 hours under typical use.
• Aluminum body and projection lens aid heat dissipation.
• Constant-current driver protects LEDs from voltage swings.

Who is this for? These iBrightstar switchback LEDs are a good match for drivers wanting a modern, highly visible DRL or parking light that also functions as a distinct amber turn signal. They suit car, truck and SUV owners who prefer a plug-and-play upgrade for 3157-series sockets, are comfortable confirming fitment, and can install or have installed load resistors if their vehicle requires them to prevent hyper-flash or error codes.