* This Nano Full Spectrum Reef Light is designed for Nano saltwater aquariums, Macroalgae reef Jars or any other small reef tanks. No matter what shape your container is, just simply put it on the black base and turn the light on, that's it. * With a premium glossy black acrylic base, this full spectrum LED light looks sleek and modern, matching a contemporary home style and colorful coral reefs. * Equipped with two kinds of high-quality LED beads, which can be switched to three channels - white light only, blue light only and mixed color light. Perfect blue light can promote producing the amount of Vitamins D3 which will help coral absorb Calcium so that coral will appear more brighter color, suitable for coral, platypus and other creatures. * Two watts options for your choice- 7W - Max Height - 17inch (43cm) , Black Base Size - 10.5X11 inch (27X28cm) 12W - Max Height- 21inch (53cm), Black Base Size - 13X13.5 inch (33X34cm)