WavePoint 2X 54W Electronic Ballast Model # A1-7-2 for 01003 & 01021 T5 HO Fixtures For the WavePoint T5 48" High Output Aquarium Lighting Fixture, 4X54W Model No. 01003 and for the WavePoint 48" T5 HO 4-Lamp Aquarium Retrofit Kit Model No. 01021 The ballast this replaces will have Model No: A1-7 and NOTE: T5 2x 54W BALLAST written on the ballast. IMPORTANT: This fixture has two ballasts. The ballasts are the same, but the connectors are different.