In regards to using the lights for crappies,we have been doing that for a lot of years too.There is a light that is like a large test tube,it has to be under water or it will burn out.The cord is real long so you can adjust the depth.Candlepower 250,000.These are awesome and work better than any other setup for us.In the summer,if you use lanterns,you have to keep your mouth closed because of the bugs,it sucks.