Hanglampen
Above a dining table, leave 75 to 85 cm between the tabletop and the bottom of the lamp. That lights the table properly without blocking your view of the person opposite - the single most common mistake in a dining room.
For diameter, about a third of the table width works: roughly 60 cm above a 180 cm table, or three smaller lamps in a row. Most models let you shorten the cord or chain; the available play is stated with the product. Bulbs are usually not included.
See also chandeliers and the kitchen range.