Design for a carnivorous fungal colony - uses toxic spores to cloud vast areas and then the lights act as lures to unsuspecting prey.
"...and through the corrupted cloud of spores lights shone brightly. Like a moth to a flame, they were drawn in, and marched steadily closer and closer in a trance like beat. As the smog cleared and the lights became clearer, they realised they were walking slowly to their doom, but it was too late. The noxious fumes drove them to put each foot in front of the other. One by one they shuffled slowly closer and closer, unable to escape their putrid death."