ADVANCE LI501-H4 Ballast Ignitor, 400W, HPS, Length: 2 1/2 in
Val-U-Pak Plus (77L), Ballast Ignitor, High Pressure Sodium Ballast Bulb Type, Max. Bulb Watts 400 W, Max. Distance to Bulb 2 ft, Number of Bulbs Supported 1, 1 7/8 in Diameter, 2 1/2 in Length
