The Lowdown on LED Tail Lamp Replacement

DIY, Guides, Lighting & Lamps  /   /  By Daniel Gray

Looking for a cool car mod you can accomplish in less than an hour? Try replacing your car or truck’s old incandescent taillight bulbs with state-of-the-art light-emitting diode (LED) bulbs. Any DIY enthusiast who can handle a screwdriver can install a set of LED tail light bulbs with minimal effort. You could even install an LED lamp board for older cars to provide more lighting options.

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LED tail lamps first appeared at the turn of the 21st century, introduced in the 2000 Cadillac Deville. Since then, LED lights have become increasingly prevalent. They are the preferred rear lamp technology among vehicle manufacturers not just because LED tail lamp bulbs look cool but also because they literally run cooler, illuminate more rapidly, draw less electricity, and have a significantly longer life.

Stick With Street Legal LEDs

It is not recommended to use LED tail lamps marked for off-road use in street applications. Your claim could be denied if your vehicle is involved in a rear-end accident and the insurance adjuster determines that you had off-road LEDs. You also run the risk of failing a yearly state safety inspection. Off-road LEDs might even provide a police officer with a reason to write you a costly ticket.

SYLVANIA 3157 ZEVO Red LED bulbs

SYLVANIA 3157 ZEVO red LED bulbs

Fortunately, major bulb manufacturers now offer street-legal LED tail lamp bulbs to replace incandescent bulbs. Most can provide dual-intensity replacement lamps to match your original dual filament bulbs. Some insert a more significant number of surface-mounted device (SMD) LEDs for a brighter output. Many bulbs offer lights with a choice of red, amber, or shades of white. You can get the amber LEDs for turn signals and side clearance light fixtures. You should match the color of the LED with the lens color.

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Choose Wisely

Philips Ultinon 3157 red LED bulbs

Philips Ultinon 3157 red LED bulbs

Some vehicles may experience “fast-flashing” when LED tail lamp bulbs are used due to low current, triggering an outage detection system. Usually, the easy solution is to replace the flasher relay with one designed to work with LEDs.

Most sellers will indicate which LED lamp is compatible with the existing stock bulb and light socket. Cool, of course, always costs an extra buck. Quality LED tail lamps are more expensive than conventional incandescent bulbs, and you should choose your brand wisely.

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LED Panels

1957 Chevy LED tail light

1957 Chevy LED tail light

The rear taillight lens is large on many older cars, but the incandescent bulb is small. So, replacing it with an LED tail lamp bulb still gives you only one spot of light. An alternative is to install an LED panel or board. These panels come in the shape of the rear taillight lens and have an electrical connector that fits the stock lighting socket. Digi-Tails offers a variety of LED tail light upgrades for American classics, like the 67-68 Chevrolet Camaro (shown at the top of the page) and Buick Grand National.

Digi-Tails Buick Grand National LED tail light panel

Digi-Tails Buick Grand National LED tail light panel

The panel consists of an extensive array of LEDs, so the entire lens is aglow when lit up. Some panels are configured to allow for a sequential motion when used as a turn signal. Confirm that the panel fits your taillight fixture, as it offers a modern look to a classic ride.

LED Reverse lights - 1999 Honda Civic EX

LED Reverse lights – 1999 Honda Civic EX

If you replace the incandescent tail lamp, stoplight, or turn signal bulbs, use street-legal LEDs from a reputable manufacturer. Save the original packaging and keep it with the car to prove they are DOT-approved.

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About the Author

Daniel Gray is a best-selling tech author, trail-blazing blogger, recovering road-test editor, OG automotive YouTuber, and semi-retired delivery driver. His latest project, “The Last Mile Is the Front Line,” explores the over-hyped promises and unseen challenges of grocery delivery, where sustainability is paramount.