Includes: Shade and diffusers. One illuminated logo badge and one black logo badge. Light sold separately. Fits Hydra 26, 26HD, and the new 32HD. By installing a full diffuser you will blend and diffuse the entire cluster of led channels into one uniform spectrum resulting in a more natural shimmer and elimination of the disco ball effect. The result is a more vibrant and relaxed viewing experience of your reef tank. The 3DReefing diffuser will also reduce light bleed and reduces par 10-15% which is minimal. Customers report better polyp extension, coral growth, and just an overall improvement in visual aesthetics of the reef tank.