The Advance 71A8472 Autotransformer Ballast is a high-quality unit designed to provide reliable performance for industrial and commercial lighting systems. With a power output of 400W and compatibility with various voltage options (120/208/240/277V), this ballast is versatile and efficient in maintaining consistent lighting levels. The unit comes as a single package and is manufactured by Advance, a trusted name in the industry. Perfect for updating older lighting systems or ensuring optimal performance in new installations, this ballast is a valuable asset for any business or industrial setting.