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Mistake #3: Picking the Prettiest Chandelier

Reason why people do it: Lighting stores often have high ceilings and tons of inventory—a combination that can fool the eye.

Reason why it's a mistake: The "Too's"—a fixture turns out to be either too big for the table, too small for your room, or hung too high or too low.

What to do instead: A handy rule of thumb for choosing a dining room chandelier: Add the room's length and width in feet and convert to inches, so a 12-by-15-foot room would give you 27 feet, which means the diameter of your chandelier should be approximately 27 inches.

One extra tip to keep in mind: A chandelier should be hung 30 to 36 inches above the table.