Alla Lighting T25 3156 3157 LED Turn Signal

Alla Lighting T25 3156/3157 LED bulbs are high-output, dual-filament replacements designed to upgrade rear turn signals, brake/tail lamps and reverse lights with bright, 2835-SMD illumination and a built-in IC driver.

These wedge-base LEDs swap directly for common T25 sockets (3156/3157 cross-reference) to deliver crisper white light, faster response and a longer-life alternative to incandescent bulbs. Each bulb packs 39 high-performance 2835 SMD chips arranged for 360° illumination, paired with a projector lens and a smart IC driver to stabilize current from 12–14.8V. Sold as a set of two, they are intended for vehicles where the OEM bulbs use the listed part numbers; verify compatibility before ordering.

How do these bulbs perform compared with stock incandescent lamps?

The Alla Lighting LEDs produce much higher measured output and a quicker on-off response than incandescent filaments, improving visibility and the speed at which other drivers perceive your signals. Because they draw less current than traditional bulbs, some vehicles may require resistors or CANbus adapters to prevent hyper-flashing or dashboard errors.

• Approx. 800 lumens per bulb, 1600 lumens per pair for strong rear illumination.
• 39 x 2835 SMD chips per bulb for even light spread and minimal hot spots.
• Faster electrical response improves signaling clarity to following drivers.
• Lower power draw may need external resistors on some vehicles to avoid errors.

Will these LEDs fit my car, truck, or motorcycle?

They use a W2.5x16q D.F. wedge base and are designed as universal dual-filament replacements for single- or dual-filament sockets that accept 3156/3157-type bulbs. Always match your OEM bulb part number against the cross-reference list before purchasing to ensure a proper fit.

• Direct drop-in replacement for 3156, 3157 and many equivalent part numbers.
• Compatible with both standard and CK/SRCK socket types in most vehicles.
• Non-polarity design simplifies installation — bulb orientation generally won't matter.
• Physical size: approx. 2.15" x 1.67" x 0.71" — check clearance in housing.

What electrical and longevity features should I expect?

Each bulb contains a built-in constant-current IC driver that helps maintain consistent brightness across a typical vehicle voltage range. The upgraded driver and quality 2835 LEDs improve lifespan versus incandescent bulbs, and a one-year warranty covers manufacturer defects.

• Operates over 12V–14.8V with a stable current IC driver for longer life.
• Non-polarity reduces installation errors and orientation concerns.
• May require additional resistors in vehicles sensitive to lower current draw.
• Manufacturer one-year warranty for defects; USA-based support.

How do I install them and what should I watch for?

Installation follows the same procedure as replacing any wedge-base bulb: remove the old bulb, insert the new LED, and test the circuit. If you notice rapid flashing, no light, or a dash error, add a resistor or CANbus-compatible load to correct the reduced current draw.

• Turn off power and remove the old 3156/3157 bulb before installing LEDs.
• Test signals, brakes and reverse functions after installation to verify operation.
• If flickering or errors occur, consider an inline resistor or error-cancelling harness.
• Confirm socket compatibility and physical clearance in the lamp housing.

Who is this for? These Alla Lighting 3156/3157 T25 LED bulbs suit drivers who want brighter, faster-reacting rear lights with lower power draw—owners of cars, trucks, SUVs and motorcycles that use the listed wedge-base part numbers. They are ideal for anyone upgrading worn or dim incandescent rear lamps and seeking a long-lasting LED solution, provided the buyer confirms socket compatibility and, where necessary, plans to install resistors or CANbus adapters for vehicles sensitive to reduced current draw.