Ballast Dimensions: 120 Watt 120V: L= 9.37", W= 4.07", H= 2.40" 120 Watt 220V: L= 9.37", W= 4.07", H= 2.40" 120 Watt 277V: L= 9.37", W= 4.07", H= 2.40"
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