Review on Pack Of 2 TMH 6 Inch Oval White LED Lights For Truck Trailer With Reverse Lamp, Turn Signal, Side Marker And Tail Functions - Surface Mount, Ideal For Trailers, Buses And Vehicles, 12V DC by Steve Yang

I bought these lights as an add-on set of reverse lights for a small concession trailer. The lights have a 4-point screw-mount setup and will need about a 3/4" hole (basically an oval will do, parallel to the long axis of the unit) for the wiring to run through as the protective epoxy at the wire exit protrudes out too far for a true flush mount.This light has the standard dual-level output of a parking/taillight setup with a 3-wire connection. I'm only going to use the black (-) and white (+) wires for the higher output (think brake lights/blinkers). The black (-) with the red (+) will give you the lower level (parking) light feature.