If you drive a 2016-2021 Honda Civic and you’re tired of those dim, yellow halogen headlights, the GTR Lighting Ultra 3 is the upgrade you’ve been waiting for. In our testing, the Ultra 3 delivered 475% brighter low beams and an absolutely staggering 742% brighter high beams compared to the stock halogen bulbs. Those aren’t marketing numbers. Those are real lux measurements taken with a digital lux meter on a wall-shot test. In this article, you’ll see exactly what those results look like, learn how to install the Ultra 3 in about 15 minutes, and find out why this bulb works so well in the Civic’s headlight housings when so many other LED bulbs fail.
What You’ll Learn
- Brightness Comparison: Real lux measurements for low beam and high beam, stock vs. Ultra 3
- Why the Ultra 3 Works: The engineering behind the 2-sided LED design
- Install Guide: Step-by-step instructions for H11 low beam and 9005 high beam
- Pro Tips from the Shop Floor: Real-world installer insights from the DLG team
- Complete Your Civic Lighting Setup: Related upgrades to finish the job
- Frequently Asked Questions
Up to 742% Brighter: Stock vs. GTR Lighting Ultra 3 on the Honda Civic
The 10th-generation Honda Civic (2016-2021) uses two different headlight housing designs: a projector housing for low beam and a reflector housing for high beam. This matters because different housing types respond differently to LED bulbs. The Ultra 3 excels in both, and the numbers prove it.
Low Beam Results (Projector Housing, H11 Bulb)
The stock H11 halogen low beam measured just 160 max lux on the wall-shot test. That dim, yellowish output is what most Civic owners are used to, and it’s the bare minimum for nighttime visibility. The GTR Lighting Ultra 3 H11 delivered 920 max lux at the brightest point on the wall. That’s 475% brighter than stock. The beam pattern retains the sharp cutoff line that the projector housing is designed to produce, so you get dramatically more usable light without blinding oncoming drivers.
High Beam Results (Reflector Housing, 9005 Bulb)
The stock 9005 halogen high beam came in at 470 max lux. That’s roughly three times brighter than the stock low beam, but compared to what the Ultra 3 can do, it’s barely scratching the surface. The GTR Lighting Ultra 3 9005 high beam measured 3,960 max lux. That’s 742% brighter than stock. Out of over 250 LED bulbs tested by the Headlight Revolution team, the Ultra 3 produced the highest lux readings ever recorded in the Civic’s reflector high beam housing.
Generational Leap: Ultra 2 vs. Ultra 3
For context, the previous-generation GTR Lighting Ultra 2 was already a top-tier LED bulb. It measured 560 max lux on low beam (250% brighter than stock) and 2,140 max lux on high beam (355% brighter). The Ultra 3 nearly doubles the Ultra 2’s low beam output and almost doubles its high beam output. If you’re still running Ultra 2 bulbs, the Ultra 3 is a worthwhile upgrade. If you’re running stock halogens, the difference is transformative.
Why the Ultra 3 Works in the Civic (When Other LED Bulbs Don’t)
Not all LED headlight bulbs are created equal. The Civic’s reflector high beam housing is particularly unforgiving with poorly designed bulbs. Multi-sided LED bulbs (3-sided, 4-sided, 360-degree designs) consistently fail in testing because their LED chips are positioned too far from where the original halogen filament sits. The stock halogen filament measures roughly 1.45mm wide. A typical 360-degree LED bulb’s light source measures nearly 13mm wide. That’s almost 10 times wider, which means the light bounces off the reflector mirrors at the wrong angles, creating a scattered, unfocused mess that’s less bright than halogen and blinds everyone else.
The Ultra 3 uses a dual-sided PCB design with custom LED chips positioned to closely replicate the halogen filament’s size and location. At 4,700 lumens per bulb, it pushes serious output, but the key is that the light goes where it’s supposed to. The result is a focused beam pattern with a defined hotspot, proper left-to-right spread, and no wasted light. Every lumen counts because every lumen is aimed correctly.
The Ultra 3 is also 100% potted and waterproof with a compact internal driver, which means no external ballast hanging off the back of the housing. It’s a true plug-and-play fit for the Civic.
How to Install the GTR Lighting Ultra 3 on Your 2016-2021 Honda Civic
The install takes about 15 minutes total for all four bulbs. No special tools required beyond the included Allen key and a Phillips screwdriver for aiming. Here’s how to do it.
Step 1: Pop the Hood and Access the Headlight Housing
Open the hood and locate the back of either headlight assembly. On the 2016-2021 Civic, both the low beam and high beam bulb sockets are fully exposed from behind. No covers, no clips, no fender liner removal needed.
Step 2: Remove the Stock Low Beam Bulb (H11)
Grab the H11 bulb socket and turn it counterclockwise to unlock it from the housing. Pull it straight out, then disconnect the OEM wiring harness from the bulb. Set the stock bulb aside.
Step 3: Install the Ultra 3 H11 Low Beam Bulb
Take your GTR Lighting Ultra 3 H11 bulb and plug it into the OEM connector. Then insert it back into the headlight housing and turn it clockwise to lock it in place. That’s it for this side’s low beam.
Step 4: Replace the Stock High Beam Bulb (9005)
Repeat the same process for the high beam socket. Turn the 9005 bulb counterclockwise, remove it, disconnect the connector, plug in the Ultra 3 9005 bulb, reinsert, and lock clockwise.
Step 5: Repeat on the Other Side
Walk around to the opposite headlight and do the same thing for both the low beam and high beam on that side. Total time for all four bulbs is about 15 minutes.
Step 6: Adjust the LED Chip Orientation
This step is critical for getting the best beam pattern. The Ultra 3 bulb is adjustable using the included Allen key. Loosen the collar on the bulb (don’t remove it completely), then rotate the bulb until the LED chips are positioned horizontally, shooting light outward to the left and right. If the chips are angled or vertical, the light won’t bounce off the reflector mirrors correctly and you’ll lose brightness and beam quality.
Step 7: Aim Your Headlights
After installing brighter bulbs, you need to verify your headlight aim. Reach behind the headlight housing with a Phillips screwdriver and find the adjustment gear. Turning it clockwise raises the beam; counterclockwise lowers it. Park 25 feet from a wall, turn on your low beams, and adjust until the cutoff line sits just below the center of the headlight height. This keeps you safe and keeps oncoming drivers comfortable.
Pro Tips from the Shop Floor
These insights come from the DLG tech support team and real-world installer experience across hundreds of Civic LED bulb installs.
Get the Bulb Size Right the First Time
The 2016-2021 Civic uses H11 for low beam and 9005 for high beam. This is a common combination, but some vehicles reverse it (for example, the 2020 Ford Expedition uses 9005 for low beam and H11 for high beam). Always verify your specific year and trim before ordering.
Why Projector vs. Reflector Matters
The Civic’s low beam uses a projector housing, which has a lens that focuses the light and creates a sharp cutoff line. The high beam uses a reflector housing, which relies on precisely angled mirrors to direct the light. The Ultra 3’s dual-sided chip design works in both types, but the reflector housing is where you’ll see the most dramatic improvement (742% brighter) because reflectors are more sensitive to LED chip positioning. Cheap, multi-sided LED bulbs are especially bad in reflector housings.
Don’t Skip the Aiming Step
The most common complaint from new LED bulb owners isn’t bulb quality; it’s headlight aim. When you go from 160 lux to 920 lux on low beam, even a slight upward aim that was tolerable with halogens becomes a blinding problem with LEDs. Take five minutes to aim properly. Your night vision and everyone else on the road will thank you.
Complete Your Honda Civic Lighting Setup
Once you’ve upgraded your headlights, the stock fog lights will look even more out of place. Here are the next upgrades to consider for your Civic.
Fog Lights
The 2016-2021 Honda Civic uses H11 fog light bulbs on most trims. You can drop another set of GTR Lighting Ultra 3 H11 bulbs into the fog light housings for a matching color temperature and significantly more output. For a more substantial fog light upgrade, the Morimoto 4Banger LED Fog Lights are a direct replacement that delivers a massive jump in fog light performance. Note: 2020-2021 Si and Type-R trims with OEM LED fog lights require an H11/H9 adapter, and the installation may require minor trimming of the bumper mounting tab.
Full Headlight Replacement
If you want to go beyond bulb upgrades, the Morimoto XB LED Headlights for the 2016-2021 Civic are a complete housing replacement that delivers a factory-finished look with projector-based LED output. Check out our full review for beam pattern comparisons and install details.
Interior LED Bulbs
While you’re upgrading, consider swapping out the interior dome and map lights. GTR Lighting makes plug-and-play interior LED kits that replace the warm yellow halogen interior bulbs with clean, bright white LEDs. It’s a small change that makes the cabin feel much more modern.
Frequently Asked Questions
What bulb size does the 2016-2021 Honda Civic use for headlights?
The 2016-2021 Honda Civic uses H11 bulbs for low beam and 9005 bulbs for high beam. Both are standard sizes that the GTR Lighting Ultra 3 is available in. Make sure to order two H11 bulbs (one per side) and two 9005 bulbs (one per side) for a complete headlight upgrade.
How much brighter is the GTR Lighting Ultra 3 than stock on the Honda Civic?
In our lux meter testing, the Ultra 3 measured 920 max lux on low beam compared to the stock halogen’s 160 max lux, which is 475% brighter. On high beam, the Ultra 3 measured 3,960 max lux compared to the stock’s 470 max lux, which is 742% brighter. These are the highest lux readings ever recorded in this housing out of over 250 bulbs tested.
Are LED headlight bulbs legal on the Honda Civic?
LED headlight bulbs installed in halogen reflector or projector housings are generally not DOT-approved for on-road use in the United States. They are commonly used for off-road applications. Check your state and local regulations before installing LED bulbs in your headlights. Many Civic owners use them for improved visibility, but it is the driver’s responsibility to ensure compliance with applicable laws.
Do I need to install a resistor or anti-flicker module with the Ultra 3?
No. The GTR Lighting Ultra 3 has a built-in internal driver that handles all power regulation. It’s a direct plug-and-play replacement for the stock H11 and 9005 halogen bulbs. No resistors, no anti-flicker modules, no external ballasts. If you experience any flickering (rare on the Civic), contact GTR Lighting’s support team for a quick resolution.
What is the difference between the GTR Lighting Ultra 2 and Ultra 3?
The Ultra 3 is the third generation of GTR Lighting’s flagship LED bulb line. Compared to the Ultra 2, the Ultra 3 delivers significantly more output: on the Civic, the Ultra 3 measured 920 lux on low beam vs. the Ultra 2’s 560 lux, and 3,960 lux on high beam vs. the Ultra 2’s 2,140 lux. The Ultra 3 also features a warmer, more comfortable color temperature for long-distance driving compared to the Ultra 2’s cooler white output. Both bulbs carry a lifetime warranty.
Does the GTR Lighting Ultra 3 come with a warranty?
Yes. The GTR Lighting Ultra 3 is backed by a lifetime warranty. If you ever have an issue with the bulb, GTR Lighting will replace it. This is one of the strongest warranties in the LED headlight bulb market.
Meet the Experts Behind Headlight Revolution
Chris Nelson – Founder
Before founding Headlight Revolution in 2011, Chris worked as an automotive install technician specializing in lighting, sound systems, and engine performance parts. He has personally tested thousands of lighting products and works directly with lighting engineers to evaluate the technical performance behind every recommendation.
Josh Beberg – Content Production Manager
Josh leads hands-on testing and content production at Headlight Revolution. From beam pattern comparisons to real-world installations, he works directly with lighting engineers to ensure every review is grounded in measured results, not marketing specs.
