Q: What is the correct lamp size to table size ratio?
Of course this all depends on what sort of table we're talking about, but it's good to keep in mind that you should always leave at least four-inches on all sides between your lamp and the edge of your table.
On a standard-sized console table that measures approximately 30-inches wide and 30-inches high, I love a large lamp with a simple shade, such as Circa's Desmond Table Lamp.
On an end table or nightstand with a smaller surface, say 15-square-inches, you should think small with your lighting choice, but compensate for scale by choosing something that makes a statement, such as Pottery Barn's Antique Mercury Glass Bedside Lamp.
On a desk surface, which typically measures 60-by-30 inches it's good to split the difference with a medium-sized lamp--in this department, I'm loving the look of something industrial, like Lamps Plus' Dimond Farmhouse Antique Brass Table Lamp.
Photograph: Justin Coit