The Superfish Qube 30 LED light kit is a safe, energy efficient, slim design LED lighting for open aquariums that clips on the top edge. 30 LEDs with high brightness and low power consumption (3w) More than 70% energy saving compared to conventional lighting. Long life span - more than 10,000 burning hours Can be used on tropical and cold-water aquariums Suitable for medium sized aquariums with a maximum glass thickness of 10mm.