Hamilton Technology Metal Halide Lighting Retrofits are for reef aquariums. Retrofits are lighting systems made for installation into existing aquarium canopies. Please visit our Retrofit Lighting Chart page to identify the best light for your particular reef aquarium. A lens must be placed between the retrofit system and the tank to prevent water from splashing on the lamps and cooling fans must be installed in the canopy to keep the bulbs cool (and limit heat added to the tank). Features:Two 175 watt 6500K mogul base metal halide bulbsTwo 96 watt compact fluorescent actinic bulbsDimensions: 60" X 9" X 5"Polished aluminum reflectorRemote metal halide ballast with 10 foot cable and quick disconnectsRecommended Accessories:To keep the light cycle consistent, we highly recommend using a timer. To achieve the dawn/dusk effect we recommend the Coralife Aqualight Power Center Timer.Replacement Parts:We carry all the compact fluorescent replacement lamps (we recommend the Current USA lamps for Hamilton Fixtures), metal halide replacement lamps and many of the replacement partsNOTE: This item is drop-shipped directly from the manufacturer. We do not offer expedited shipping for this item.