Aqua Illumination Black Hydra 32HDAI lights deliver a proven spectrum that grows coral & will push coral coloration to the MAX. This newest generation of Primes and Hydras moves forward with that focus and delivers more PAR (Photosythetically Active Radiation) and resulting PUR (Photosynthetically Useful Radiation) increasing the efficiency and value of these lights. Additionally this has been accomplished while enhancing the colors that make coral beautiful to the human eye. The new