How to find the right Automotive Lighting Assemblies AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Automotive Lighting Assemblies
- Exact fitment, including trim
- Match year, make, model and trim, and ideally the OEM part number printed on the old housing. Halogen, HID and factory-LED trims of the same car usually use different assemblies. The same model year often has several headlight or taillight variants with different mounts, connectors and wiring. A wrong-trim unit may bolt in but not plug in.
- Road-legal marking
- Look for a DOT/SAE marking molded into the lens or housing, which shows compliance with FMVSS 108 in the US. Unmarked styled housings can fail inspection, and they often have poor beam cut-off that glares at oncoming drivers.
- Housing type matches the light source
- Reflector housings are designed for the bulb they shipped with. Use projector housings when running HID or LED sources. Putting a brighter source in a halogen reflector scatters light. You get glare and a worse usable beam.
- Replacement-grade certification
- For collision-replacement parts, prefer CAPA-certified or OE-equivalent units. Certified aftermarket parts are checked for fit and photometric performance against the original.
- Side and quantity
- Check whether the listing is for the driver side, the passenger side or a pair. Single-side listings are common and are an easy ordering mistake.
- Bulbs and connectors included
- Check whether bulbs, sockets, ballasts or LED modules are included or have to be moved over from the old unit. A lot of assemblies ship as bare housings, so you need to plan for the extra parts and labor.
Brands that matter
- Depo: Large OE-replacement maker; many CAPA-certified headlight and taillight assemblies.
- TYC: OE-replacement maker with broad coverage for common cars and trucks.
- Hella: OE supplier to many automakers and also sells auxiliary lighting.
- Morimoto: Projector-focused aftermarket headlights for enthusiasts. Pricier than OE-replacement brands.
- Anzo: Styled aftermarket headlights and taillights. Check each unit for a DOT marking.
- Spec-D: Budget styled assemblies. Fit and finish vary, so verify fitment and compliance.
What to avoid
- Assemblies with no DOT/SAE marking if you drive on public roads.
- Dropping HID or LED retrofit bulbs into halogen reflector headlights.
- Ordering by model alone without checking trim and factory lighting type.
- Heavily tinted or smoked lenses where your state limits lamp tint.
Questions
OE-replacement or styled aftermarket?
OE-replacement units, such as Depo or TYC, restore the factory look and beam. Styled units change the appearance, but quality and legality vary more.
Should I replace headlights in pairs?
Usually yes. A new lens next to an old yellowed one looks mismatched and puts out noticeably different light.