Pick a light fixture that relates to the dining room table, not the room itself—in terms of size, shape and style. Round fixtures like chandeliers go best with round tables, whereas linear lights look their best with rectangular tables.
The dining room light should be at least 12 inches smaller than the table in all directions. So for a 4-foot wide table, you want to look for a light that's no more than 2 feet wide.
For proportion, linear suspension lights should be anywhere from 1/3 to 2/3 of the length of the table.
All dining lights should hang about 30 inches above the surface of the table (no need for face-to-light contact with a tall uncle).
If you like it then you shoulda put a dimmer on it – install a dimmer with a dining room chandelier, and make sure the fixture itself is dimmable (note: installing a dimmer and a light fixture that is dimmable are two different, but important, things).
A decorative chandelier in the dining room generally offers a low level of light output—they're really about setting the mood and drawing your eye to the center of a room. For functionality, use layers of light with recessed lights, wall sconces, etc.
When adding layers of light, think vertically—layers from the ceiling to floor—and horizontally—layers from one side of the room to the other.
Determining the necessary wattage requires a bit of math—we like this tip from Kichler Lighting: Multiply the width by the length of the room. Multiply that number by 1.5. That equals the amount of wattage for general light in the room.