Some wiring may vary however this is the most common wiring scenario for a 120 volt light fixture.
Wiring porch light fixture.
However it s likely that the light fixture was mounted in the middle of a stud cavity which makes mounting a box that can support the weight of the fixture more difficult.
Light fixtures with more than one lamp may have a pair of black and white wires for each lamp.
Several types of remodeling boxes can do the job but we recommend a 2 x 3 in metal remodeling box that s 2 1 2 in deep for fixtures up to about 6 lbs.
These connect to the black and white wires in the electrical box with the provided larger wire nuts.
Make sure the power source is turned off.
Low voltage lighting systems must be listed by an approved testing agency as an entire system or assembled from individual components that are listed.
Exterior light fixtures do not require gfci protection.
Support the fixture with a wire coat hanger.
Fold the wires into the box and install the fixture onto the mounting bolts.
Splice the white lead to white wire and black to black.
Wire the switch install a bulb and test.