I've tried the lights in my prawn traps. I've noticed no real difference. I started out with lights in all pots and caught prawns. Then I experimented with putting lights in 1/2 the pots and 1/2 without. I saw no noticable difference. I still have them wired in to the pots (they are water activated) since they certainly didn't hurt the catch so I figured I might as well use them since I have them.