The VLO 3000K 12V LED Underwater Accent with Lumen Effects System allows you to switch between three lumen outputs: 100, 200 or 400 easily with the use of the Magnetic Key, which can be used to adjust the fixture underwater. Equipped with a removable and adjustable cowl and mounting bracket, the VLO Underwater accent light is perfect for use in ponds, fountains, water gardens, docks, streams, and is safe for use with aquatic wildlife and virtually any water additives.