I have been using the BK-80D for about 3 weeks now and so far I am impressed with its performance.  This model is bright and powerful and destroys every bug that is lured into it, it slays mosquitos.  I actually have a much smaller yard than 1.5 acres, however my theory is that at dusk when its slightly light out, I wanted the light to be bright enough to make the bugs choose the light and not me.  It is set up about 35 ft from our deck and that theory has worked great so far.  This design also has not clogged up at all with continuous nightly use.  Most bugs, especially mosquitos, fall to the ground after hitting it which is why many people don't think it works with mosquitos.  If they don't see them stuck to it, well it must not work.  I doubted it at first also until I stood next to it in the dark and saw the swarm around it.....which it continuously zapped.  Tiger mosquitos will not be attracted to the octenol bait but should still go after the light, at least mine do.