Ballast Dimensions: 250 Watt 120V: L= 9.37", W= 4.70", H= 2.85" 250 Watt 220V: L= 9.37", W= 4.70", H= 2.85" 250 Watt 277V: L= 9.37", W= 4.70", H= 2.85"
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