The 13W UVC Timer Aquarium UV Clean Light Algae Clear Green Bloom Clean Fish Tank UV Water Clean Lamp for Sump Pond Filter Tank is a modern and stylish way to keep your aquarium clean. With a 254nm wavelength and 13watt output, this lamp provides plenty of light for your fish. The LED clock allows you to set the time to open or close the lid, and the timer switch turns the light on or off every hour, six hours, or twelve hours. This lamp is perfect for keeping your fish healthy and looking their best.