Hydro Glow designed the 12 vdc low amperage fluorescents to produce a green glow similar to that emitted by chemical light sticks in widespread use by divers to lure fish.Not only do Hydro Glow lights draw baitfish, they draw fresh- and saltwater fish as well. In fact, the first swordfish ever taken by fly and fly rod came in the green light of a Hydro Glow off Florida's coast.