Sunpark LC-12014T (1) FC12T9 32 Watt Circline (1) 2D 38 Watt (1) FC16T9 40 Watt Circline (1) FC9T9 30 Watt Circline Lamp Compact Electronic Fluorescent Ballast With Circline Lamp Plug 120 Volt 120v lamp holder attached electronic the mfg has changed this item, and no longer has a T in the part number the size of this ballast has been slightly altered by the mfg.