Outdoor Lighting Industry Size Guidelines
Front (Exterior) Door Fixture (‘s) = The fixture should be 1/3 the height of the door if there is only one and 1/4 the height of the door if there are two (one on each side of the door).
Garage Door Fixtures = the size of the fixture should be ¼ to 1/3 the size of the height of the garage door opening when installed on either side. Fixtures installed in the center should be large enough to light the entire width of your driveway. Measure both the height of the garage door and the width of the driveway and go from there.
**Cut a piece of cardboard to shape and hold it up to the house to help visualize size.**