ROBERTSON 3P20129 RSO140C120WS /A Fluorescent eBallast for 1 FC16T9 or FC12T9 Circline Lamp, Preheat-Rapid Start, 120V, 50-60Hz, Normal Ballast Factor, NPF (Replaces RSW140C120 WS /A) Equivalent to Keystone KTEB-140-1-TP-WS-EMI, Fulham WH3120L Save by ordering the Quik-Pak of 10 individually packaged ROBERTSON units 2P20129 Offering the broadest ballast/LED Driver line available on Amazon. Take advantage of Robertson's 60 years of electronic design and quality manufacturing experience. Go to RobertsonDirect.com for complete technical data.