Alla Lighting T25 (3157/3457) Switchback LED Bulbs 6000K White / Amber - 28-SMD High Output, Plug-and-Play

Alla Lighting T25 switchback LED bulbs deliver bright 6000K white for parking/DRL and vivid amber for turn signals in a single 3157-style wedge.

These are a higher-output LED replacement designed to combine daytime running light or parking light function and amber signaling in one dual-filament T25 (3157/3457-compatible) bulb. Each lamp uses 28 high-power 2835 SMD chips to increase on-road visibility while keeping the compact wedge footprint and plug-and-play form factor common to many cars and trucks. They operate on 12–18V systems and include a one-year manufacturer's warranty.

How bright and visible are these switchback LEDs?

Brightness is stepped up by the dense 28-piece 2835 SMD array, giving a crisp xenon-white for DRL/parking and a saturated amber for turn signaling. The bulbs are tuned to be highly conspicuous in daylight and nighttime conditions without requiring major housing changes.

• 28 high-efficiency 2835 SMD chips per bulb for strong output
• 6000K xenon-white for parking/DRL clarity
• Pure amber/yellow for turn indication to meet visual contrast needs
• Works on standard 12–18V automotive electrical systems

Will these fit my vehicle and replace my 3157/3457 bulbs?

They are built in the common T25 wedge shape and are compatible with many 3157/3457-style sockets. The listing covers a wide range of cross-references; verify socket type and dual-function arrangement (parking/DRL + turn signal on same bulb) before ordering.

• Direct fit for many 3157, 3457, 4057, 4157 and similar T25 wedge sockets
• Dimension: approximately 0.71 in diameter × 2.50 in length
• Requires the original bulb location to support combined parking/turn function
• Check application guides or your owner's manual for bulb type confirmation

Do I need extra hardware to prevent hyper-flash or error codes?

Because these LEDs draw far less current than incandescent filaments, many vehicles will show fast-blink (hyper-flash) or a bulb-out warning without added load. Installing a specified load resistor resolves flash-rate and CAN-bus detection issues on most systems.

• Recommended: one 50W 6Ω load resistor per circuit to mimic incandescent draw
• Some CAN-bus vehicles may still require an electronic Canceller or adapter
• Professional installation of resistors is advised to avoid wiring heat or connection problems

How durable are these LEDs and what warranty is included?

The design focuses on longevity with modern 2835 SMD chips and automotive-grade construction. Alla Lighting backs these bulbs with a one-year warranty covering manufacturing defects under normal use.

• Rugged SMD construction for long operating life
• Operating voltage range: 12–18V DC suitable for most vehicles
• One-year limited warranty against defects
• Not intended to alter sealed-lens housings or replace required external optics

Who is this for: The Alla Lighting T25 switchback LED set is intended for drivers who want a single-bulb solution to combine bright white parking/DRL functionality with clear amber turn signaling, in vehicles that use dual-function 3157/3457-style sockets. It suits enthusiasts upgrading visibility, fleet vehicles aiming for consistent light output, and owners replacing aging incandescent wedge bulbs—provided you can install or have installed the recommended load resistor where needed.