Our front yard is being re-landscaped including some steps that end with stone columns. The columns will be approx. 30-35" tall, and about 16" square (actual size is yet to be determined).

We're shopping for a light for the top of each column. We're wondering how to determine the size of the light based on the height and width of the column.

We're estimating that a light approx. 14-16" tall would be about right.

Is there a rule of thumb in selecting a size proportionate to the size of each column?