Optics and Output Output in terms of PAR, color mixing and spread are all improved with the new fixtures. The incorporation of more LEDs results in a more targeted full-spectrum, TIR lenses shape the light's output and improve its efficiency. The result is more color POP as well as a slightly wider output area and higher average PAR. A combination LED placement and lens geometry blend the light from the clusters so that color separation is further reduced. Coverage Effective Spread: 30" x 30" Effective Depth: 24" Recommended Mounting Height: 8-10" The Hydra 64HD delivers more output with a higher average PAR than any other AI Module. HD AI's popular HD functionality, through which a user can route power not in use by one color channel into another color channel is a much-loved feature on the previous generation HD fixtures. As the new product names imply (Prime 16HD, Hydra 32HD, and 64HD) all the new HD lights retain this exciting feature. Mounting Find the perfect mounting solution for your set up! Choose from the following Hydra Mounting System Components (sold separately): Hydra Flex Arm – Flexible arm to attach Hydra LEDs to the wall of your aquarium HMS Multi Light Mount Kit - Includes vertical HMS rails and mounting feet that can sit on the side of your aquariums rim. HMS Hanging Kit - Allows you to suspend the HMS Tracks from your ceiling or wall brackets. HMS Multi Light Track - Select the track that matches the length of your tank HMS Hydra 32 or HMS Hydra 64 Bracket - Custom brackets that hold your particular Hydra LED light and lets you slide and spin each light individually for the perfect positioning. . Specifications: Dimensions: 11.875" L x 5.375" W x 1.42" H LED Channels: 7(+1) Number of LEDs: 64(+4) Power Consumption: 135 watts Optical Reflectors: TIR (total internal reflectors) What's Included? 1x White Aqua Illumination Hydra HD 64 Light Fixture 1x Aqua Illumination Hydra HD 64 Power Supply