Specs
Install
Features
- Brighter, cool white LED output
- Direct replacement for Audi S4 reverse light bulb
- Plug and play, no modification with factory 921 bulb size
- Improved visibility behind vehicle
- Available in multiple brightness levels
Overview
Brighter Backup. These replacement LED bulbs are a great way to improve the look and function of the reverse light on your Audi S4. You will get higher visibility at night, with a modern look. The installation is straightforward, with just a bulb swap - making this one of the easiest ways to improve the S4's lighting.
Brightness. All Diode Dynamics LED lighting is rated with accurate, measured lumen figures, not calculations or guesses. We test the true output in-house, and provide you the real numbers to compare.
Colors that match. Most of us have seen lighting setups with random shades of white that don't quite match. At Diode Dynamics, we operate an integrating sphere, which is a piece of lab equipment used to analyze exact color spectrum of the LED bulbs we produce. By testing each batch of products, we can ensure that all bulbs will match in color, to avoid various tints of white. These bulbs will match any other upgrades you may have from Diode Dynamics, for factory-style uniformity and a clean appearance.
Reliability. Diode Dynamics LEDs are built with constant-current inductive circuitry, along with transient suppression. They are tested by our engineering team with a device that replicates years of voltage spikes, like the ones generated each time the alternator starts and stops on your S4. This is what kills most LED bulbs over time, but just like factory components, Diode Dynamics LEDs are designed with built-in circuit protection. While more expensive than simple bulbs, this allows Diode Dynamics LEDs to last for years, with no flickering or failure.
Experience. After over a decade in business, Diode Dynamics is one of the most trusted names in automotive LED lighting. We directly assemble and engineer an increasing number of products in the United States, allowing for higher quality and performance, with the newest and brightest LED technology. Whether it's a Audi or anything else, we pride ourselves in offering only the best possible LED solutions. Please contact us if you'd like to discuss your lighting project!
Bulb Options
921 HP5 - More details
- Single Samsung 3W emitter under diffusing lens.
- Inductive driver circuit in compact package.
- Molded construction with sturdy double terminals.
- 92 lumens per bulb.
921 HP36 - More details
- Omnidirectional LEDs for full distribution in housing.
- Metal base for thermal dissipation and reliability.
- Nonpolar circuit design with voltage spike protection.
- 210 lumens per bulb.
921 XPR - More details
- 16 high-power LEDs arranged on all four sides.
- Fully metal heatsinking for maximum output.
- Inductive constant-current drive circuit.
- 720 lumens per bulb.
What's Included
Fitment
Specifications
What's Included
Installation
Installation Time: 10-20 minutes
Tools Needed: Basic Toolset
Modification: None
Installation Guide: Click to download
Warranty
3 Year Replacement Limited Warranty
All Diode Dynamics products come with a 3 Year Worry-Free Warranty.
If you experience any defect with a product, we will do some quick troubleshooting, and if necessary, provide a replacement. There is no need to wait for a return and repair process. Click here to learn more.
