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Considering the size of the fixture is important to ensure it doesn't stand out too much compared to the doorway, yet still provide enough light to be functional. So how do you determine lantern size for a front door? As with so many other things, the answer depends.
If you're only placing a sconce on one side of your doorway, the physical lantern should be 1/3 the height of the door from top to bottom. Be sure to consider any artsy long tails or top scrolls with the fixture when determining size. The center of the bulb should rest 66" above the threshold of the door.
If your doorway has space for sconces on both sides of the door, then the 1/3 rule may be slightly overpowering. In this case you should look for lanterns that are 1/4 the height of the door, but still make sure that the base of the bulb is 66" above the door's threshold. Again, be sure to consider the artful use of materials on the top or base of the lantern's size.Hinkley also says that it's a good rule of thumb that your lantern should appear to be half the size of your doorway from 50 feet away. Be sure to check out Hinkley's information page on Lighting Universe, where you can browse their great selection of outdoor lanterns and other lights.