Placement: Place your electrical box for your exterior light so that the top of the fixture is 20% lower than the top of the molding. Allow for the side door molding also.

Size: Outdoor lamps should be approximately one fifth the height and width of the doorway, including trim. (For example a 100″ high by 60″ wide entrance would require an 20″Hx12″W fixture.) Post lights should be as large or larger than the lights at your front door.

Style: Outdoor lights should be compatible with the look and lines of a house. Door lamps should be approximately one fifth the height and width of the doorway, including trim. (For example a 100″ high by 60″ wide entrance would require an 20″Hx12″W fixture.) Open bottom fixtures are better for down lighting an area, and glass-topped lanterns are the better choice for accenting architectural elements above and around the door.
Post lights should be as large or larger than the lights at your front door.
Wall-mounted fixtures with arms or brackets can fit into tighter spots in areas between moldings. Fixtures with several low wattage candle bulbs are superior to those with a single bulb since they provide more light with less glare.