This light fixture has a Black and White wire with bare striped ends to hook to the Black and White wires in the junction box. In addition the lamp fixture has a yellow wire that is soldered to the circuit board inside the light housing box. The yellow wire is not the normal industry standard color coding for a ground wire, (s/b, bare copper, Green, or Green with a Yellow strip).
Because this lamp fixture is a plastic fixture there is a need to ground the circuit board holding the diodes/resisters, this yellow wire is soldered on the circuit board for this grounding purpose.
Yellow Wire/Ground for this model 7912 LED Flood Single Head w/110 mot Sqr