Electronic Ballast Switchable
A look at what is currently available on eBay
 AC ELECTRONICS ESPQ-A54T5S-S - Switchable 4 to 2, 3 to 2 or 3 to 1 Ballast!!!! US $54.70 
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 P34 AC ELECTRONICS SWITCHABLE BALLAST ESPQ-A54T5S-S 120/277V LOT OF 7 NEW DEAL!! US $149.99
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Items recently purchased from this site
1000w Digital Electronic Ballast HL HPS MH Switchable 120/240 Volt Dimmable, LUMATEK 600W ELECTRONIC BALLAST SWITCHABLE 360W 400W 600W SUPER LUMENS FREE SHIP, P34 AC ELECTRONICS SWITCHABLE BALLAST ESPQ-A54T5S-S 120/277V LOT OF 7 NEW DEAL!!, NeXtGen Electronic Ballast, 400w Switchable Digital Ballast - 90/260 volt, AC ELECTRONICS ESPQ-A54T5S-S - Switchable 4 to 2, 3 to 2 or 3 to 1 Ballast!!!!,