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Home RenoVision DIY - How to Replace an Exterior Flood Light with Motion Sensor

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Short Summary

Main recommendation: Replace an old exterior flood light with a new motion-sensor fixture by turning off power first, wiring white-to-white and black-to-black, and sealing with the fixture's insulation gasket instead of caulk. The presenter installs a basic, low-cost unit as a temporary fix while a larger rewiring project of this whole half of the house is planned for the winter. The video focuses on a difficult recessed junction box in an 1880s house.

Key Points

  • Turn off the light switch before touching anything, since the presenter stresses safety throughout.
  • Expect a difficult old junction box: the house dates to 1880, the box is deeply recessed, and the wires are short.
  • Use a basic, inexpensive fixture (about $17) as a stopgap until the wall is gutted and rewired.
  • The fixture's thermal insulation forms the weather seal, so no caulk is needed; the presenter dislikes caulking exterior fixtures.
  • Because the box does not extend far enough, the fixture is screwed into the wall itself with simple thread.

Details Worth Noting

  • Concrete instructions:
    • Turn off the light switch first and confirm the power is off before handling wires.
    • Check the fixture's installation instructions before starting, since some details are needed later to set up the motion sensor.
    • Remove the old fixture, noting that the old parts may be salvageable.
    • Twist the white wires together and the black wires together, then push them back into the box with no contact between the two groups.
    • Make sure the thermal insulation sits in the correct position so it seals the fixture.
    • Screw the fixture into the wall using simple threads, turning clockwise.
    • Adjust the two light heads by tightening the set screws, aiming one toward the dog area and the other toward the car parking area.
    • Before closing up, test the power using a light from another deck to rule out simply burned-out bulbs. The presenter's test light worked, and the fixture needed two more bulbs.
  • The old mounting bracket was described as nearly unusable, and the house appears to have had three or four earlier fixtures installed over time.
  • The presenter notes that working on a client's house this way carries a calculated risk, since the wall will be opened and later repaired by an electrician.

Bottom Line

The job is a practical, temporary upgrade: a cheap motion-sensor fixture, careful wiring in a difficult old box, and a seal that relies on the fixture's own gasket rather than caulk.