The biOrb CLASSIC LED light unit is designed to replace the original light supplied with biOrb aquariums. It will fit the CLASSIC 15. The light is part of the biOrb AC range and will only work with the black transformer unit (not supplied). It is easy to install by plugging directly into the biOrb transformer (not supplied). The bright white LEDs have a life expectancy of 15 years or 50,000 hours of use based on eight hours per day. The BiOrb standard LED light unit illuminates the biOrb and its inhabitants, making the aquarium into even more of a feature. Designed as an easy-to-fit accessory, the light unit doesn't impose on the biOrb's attractive shape and incorporates a hole for easy fish feeding. The white light simulates daylight, which assists with plant growth and brings out the true colours of the fish. With the anti-glare shield removed (see instructions) the biOrb is transformed into a living table lamp. Please check your manual to ensure you purchase the correct size. Oase biOrb supply a range of replacement DC Classic LED lights for the biOrb aquariums, giving you more choice in the way to customise your setup.