Automotive · Head-to-head
Diode Dynamics SL2 Pro LED (H11/H8/H9) vs GTR Lighting Ultra 3 LED (H11/H9/H8)
Which should you buy? Here's the honest call, pulled from our full The Best LED Headlight Bulbs: 4 Compared (and One to Skip) comparison.
The Diode Dynamics SL2 Pro is the safest honest upgrade: accurate chip placement, real output, and a beam that stays controlled in a projector. Want the most light and the longest warranty? The GTR Lighting Ultra 3 is the step up, if it clears your dust caps.
Diode Dynamics SL2 Pro LED (H11/H8/H9)
Buy itThe bulb to beat: honest output, filament-accurate chips, and a beam that behaves in a projector.
- Dual-sided chips sit on the halogen filament plane, so the beam stays focused instead of scattering
- Real, non-inflated output with a fan-cooled 'boost' circuit rather than fantasy lumen numbers
- US brand with responsive support and a multi-year warranty
- Still sold for off-road use only in reflector housings
- Premium price for a plug-in bulb
GTR Lighting Ultra 3 LED (H11/H9/H8)
Buy itThe output leader that stays surprisingly disciplined — with a lifetime warranty behind it.
- Among the highest usable output of any plug-in LED, and the number isn't wildly overstated
- Filament-accurate dual-sided chips keep the pattern tight for the light it makes
- Fully potted, waterproof build and a lifetime warranty
- Large heatsink and fan can be a tight fit under some dust caps
- Off-road use only in reflector housings, like every bulb here
Side by side
| Diode Dynamics SL2 Pro LED (H11/H8/H9) | GTR Lighting Ultra 3 LED (H11/H9/H8) | |
|---|---|---|
| Our verdict | Buy | Buy |
| Best for | Anyone with projector headlights who wants a clean, honest upgrade from a company that stands behind it. | Projector owners who want maximum light and the longest warranty, and will check clearance before buying. |
| Price tier | $$$ · premium | $$$$ · flagship |
The bottom line
Our overall pick is the Diode Dynamics SL2 Pro LED (H11/H8/H9) - The bulb to beat: honest output, filament-accurate chips, and a beam that behaves in a projector. Choose the GTR Lighting Ultra 3 LED (H11/H9/H8) instead if projector owners who want maximum light and the longest warranty, and will check clearance before buying.
Want the full picture, including the other options we compared and the popular one we'd skip? Read the complete The Best LED Headlight Bulbs: 4 Compared (and One to Skip).