Glo T5 HO Electronic Ballast for T5 HO Fluorescent Bulbs, Fits 2 x 54 Watt T5 HO Bulbs High output electronic ballast lighting system Ideal for illuminating aquariums, terrariums, and aviaries T5 HO illumination delivers the quality of light required by many aquatic plants and corals Fits 2 x 54 Watt T5 HO Bulbs Slim and modern design; Generates a powerful light output, suitable for a variety of aquarium types