AMAX LIGHTING 120-Volt 5.13 in. Electronic Ballast 2-PLC 13-Watt Lamps HD213-120A - The Home Depot
Espen Electronic Ballast, VE213120MR-1 Electronic Ballast for circular lamps. For (2) 13W Quad Lamp, 120V, Normal Power Factor, Rapid Start - - Amazon.com
AMAX LIGHTING 120-Volt 6.63 in. Electronic Ballast 3-PL 13-Watt Lamps HD13X3-120A - The Home Depot
LUXRITE 32-Watt Equivalent 4 ft. Linear Tube T8 LED Light Bulb Ballast & Ballast Bypass Compatible 13W 3000K Soft White (4-Pack) LR34195-4PK - The Home Depot
113SHPTP, 13 Watt 120V Magnetic 2 Pin CFL Ballast by Keystone: Electrical Ballasts: Amazon.com: Tools & Home Improvement