These are not 4000k as advertised. More like 5100k.

The wiring comes with the car end harness and the trailer end harness. Connect both harnesses and use car end dangling wires for continuity checks. Wiring harness is plenty long, and the wires seemed good quality.

Replaced the original incandescent lights on my carry-on brand trailer. Very visible, even in broad daylight. Easy to install and is very similar to a oem product.

Lights appear to be of decent build quality, but the wire harness is worthless. All the coating just breaks off clean with no copper wire to use. The wiring itself is to blame.

The right running light stopped working 10 days after the return policy expired. The provided mounting screws are too small. I'm sure the supplier would have teplaced the light but wasn't worth the effort az zhaz point.