Ppunson Aquarium Fish Tank Light, 11W 20Inch White + Blue Universal Extendable Bracket LED Fish Tank Lamp 2 lighting modes: blue; blue + white.These lights are benefical to plant's growth. the lastest design, Highly pervious to light. With extendable bracket to adjust the length to fit your fish tank,fits tank 30cm--50cm in length. Easy to use : just put it on the top of fish tank and plug into the power. Ideal for freshwater and seawater. This item is non water-proof, so don't put it into the water.