Fluval A3973 Halo Marine & Reef Nano Pro LED Light Promotes and supports optimal photosynthetic activity, Coral growth and Color, and balanced viewing in marine & reef Nano Tank Environments Features C.O.B (chip-on-board) LED Technology: higher energy Efficiency, better spectral performance, greater light Output Designed for Nano and desktop aquariums up to 40 L (20 US gal.) Can be used on both rimless and aquariums with top frames (Max frame Height: 30 mm (1 1/8))