Prentissbo, I have several lights just like the links you posted. They do work well but only at night. Since grasshoppers don't fly around at night these really don't help you take advantage of the hoppers around the pond. BTW I built mine myself for about $40 each.
Matt, I'd also be interested in pictures of your ductwork but catcher.
What I'm really looking for is something like the bug light that attacts all bugs, including hoppers, during the day.
I've posted here before about a maggot feeding device that I also use to feed my fish. You let the flies convert road kill to maggots that automatically feed your fish all day long but not at night. Works good if you have a place where the smell doesn't bother anyone.
