D1S and D2S LED Bulb Replacements – Are They Brighter Than HID?
Many vehicles left the factory with HID projector headlights. Cars like the Nissan 350Z, Chevy Silverado, GMC Sierra, Ford F-150, and Camaro all use factory xenon systems.
So the big question is simple:
Are D1S or D2S LED bulb replacements brighter than HID?
Short answer: No.
If your vehicle uses a factory D-Series HID bulb, you should stick with HID replacements.
What Are D-Series HID Bulbs?
Factory xenon systems use:
Originally, D1 and D2 were common. Later, manufacturers introduced D3 and D4, which removed mercury for environmental compliance.
Most D-Series bulbs share the same mounting collar, but the igniter and ballast designs differ.
HID vs LED Physical Differences
At first glance, LED replacements look similar. They copy the mounting collar so they fit inside the projector.
However, there’s a major difference:
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HID bulbs use an arc capsule.
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LED bulbs use flat-mounted emitters.
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HID systems rely on a ballast and igniter.
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LED bulbs require drivers and external wiring.
That difference in light source geometry is exactly why performance suffers.
Why D-Series LED Bulbs Are Not Plug-and-Play
Factory HID systems include:
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A ballast
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An igniter
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High-voltage wiring
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Integrated power routing
With D1/D3 systems, the ballast mounts directly to the housing.
With D2/D4 systems, the ballast is separate.
When switching to LED, you must:
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Bypass or remove the ballast
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Adapt the incoming power
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Modify wiring
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Mount external drivers
Nothing about this setup is truly plug-and-play.
Beam Pattern Comparison: HID vs LED
Now let’s look at what really matters — beam performance.
HID Benchmark Setup
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Morimoto D2S projector
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Philips HID bulb
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35W ballast
Output: 2,240 maximum lux
Notice:
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Razor-sharp cutoff
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Strong hotspot
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Wide beam spread
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Consistent color
This is how a proper HID projector should perform.
LED Test Results
We tested multiple LED options:
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Two-sided emitter designs
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Angled chip layouts
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COB (chip-on-board) LEDs
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Premium aftermarket models
Here’s what we saw.
Results Summary
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850–1,050 lux average output
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Less than half of HID brightness
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Softer, unfocused cutoff
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Weaker hotspot concentration
Even the “best” LED tested came in at roughly half the output of the OEM HID setup.
Why LED Fails in HID Projectors
HID projectors are engineered around:
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Arc capsule positioning
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Plasma light source geometry
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Precise focal distance
LED emitters cannot replicate the arc shape of a xenon capsule.
Because of this mismatch:
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Beam focus weakens
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Intensity drops
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Cutoff sharpness suffers
Projector optics designed for HID work best with HID.
When Should You Replace HID Components?
If your factory HID system has issues:
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Burned-out bulb → Replace the bulb
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Flickering → Replace ballast
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Weak output → Upgrade to premium HID
Do not downgrade to LED in an HID projector.
Final Verdict
If your vehicle came with factory HID headlights:
Stick with HID.
D1S and D2S LED replacements are:
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Not plug-and-play
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Not brighter
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Not optically correct
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Not a performance upgrade
HID projectors are engineered for xenon arc sources. Matching the original technology always delivers better results.
If you’re into high-performance lighting upgrades, make sure to follow our Facebook page for the latest installs, comparisons, and product releases. For in-depth guides, expert insights, and real-world testing, check out the Better Automotive Lighting Blog— your go-to source for serious illumination upgrades.
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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.
