The newest innovation in the Hydra line from AquaIlluminationÂ®, the Hydra HD Series brings more power and color where you want it, plus the freedom to use your smartphone or computer as a controller. No longer are you limited to using a fixed amount of power per channel, the HD dynamically adjusts power available to each color, borrowing power from the colors youâ€™re not utilizing. Giving you the most vivid spectrum your tank has ever seen. The Hydra HD Series is capable of producing a limitless number of spectral combinations to fit your tankâ€™s exacting needs. There’s no need to buy an additional controller just to be able to use your light properly, the Hydra HD Series has control built-in. Use your iOS, Android or internet-connected device to control the Hydra HD, anywhere in the world!