Fit, or install, spotlights in nearly any standard junction box. A wide variety of spotlight fixtures exist, from interior can fixtures to swivelling eaves lights. Most install in a similar way. Safety should be your first and primary concern when working with household current. Use a fibreglass ladder, wear rubber-soled shoes and use insulated-handle tools while working with electricity, even with the power off, to prevent accidents.
Locate and turn off the circuit breaker to disconnect the junction box you will be installing your new spotlight onto. Use a screwdriver to remove the mounting screws. They will be located in the corners of the box face. Lift off the face plate of the junction box.
Pull the wiring from the junction, and remove the wirenuts. Locate three wires: one black, one white and one green. Match the white and black wires to the leads on the back of the spotlight fixture. Fit a wirenut onto each pair of wires, and turn it clockwise to tighten it in place. Wrap the end of the green wire around the screw on the back of the fixture, and tighten it with a screwdriver.
Fit the base plate of the spotlight onto the front of the junction box. Thread the mounting screws through the holes in the base plate into the junction box, and tighten with a screwdriver. Twist a spotlight bulb into the socket of the fixture.
Restore power by turning on the breaker. Adjust the angle of the spotlight to ensure it is lighting the intended area.