Aside from blocking light, pans hung in the open collect dust and grease
from frying.
==
I cycle my hanging pots through the dishwasher when I need a full load.

Our pans hang in a bay window about 8 to 10 feet from the cooktop. With normal
use, they don't seem to collect either dust or grease.

As to the lighting, I've got 12 50-watt floods aimed at the work surfaces, as
well as cool-running under-cabinet lights, and it seems like plenty of light. We
rarely turn them up all the way.

http://www.xhost.org/kitchen/k.jpg

-- Larry