Zoo Med's Ultra Sun High Output T5 lamps are ideal for all marine aquariums, reef aquariums, and freshwater aquariums where maximum daylight simulation is required. They produce a 6,500K high intensity super daylight which brings out the full colors of your fish, plants, corals, and invertebrates. They distribute light evenly across the water's surface, and generate less heat than metal halide lamps. Zoo Med Ultra Sun HO-T5 lamps are high quality and made in Germany. They are long-lasting, with an effective life of 10,000 hours. These new T5 lamps provide higher lumen output than ordinary T8 or T12 lamps, and are designed for use with Zoo Med's AquaSun T% HO Double Light Fluorescent Hoods. This 54W 46" lamp will fit the 48" AquaSun fixture. Combine with a Zoo Med Coral Sun HO-T5 lamp for all live coral and invertebrate reef tanks, or with a Flora Sun HO-T5 lamp for maximum plant growth!