....to really tell if it works as we are short of mosquitos this year and I have not attached the bait that comes with it to attract what there are.  I have had several of these in the past and they proved effective and this should be the same.  Bulb cost is minimal thought limits advertised effectiveness to a half acre.  I'm not sure how they figured that out but our deck is 20 feet from a small pond that hatches these guys and this little machine should be OK to zap 'em.