Robertson 3P20116, Model ISU232T8120 Fluorescent Electronic Linear T8 Instant Start Ballast for 2 or 1 F32T8 lamps operation. Ballast also accepts 2/1 F32T8U, F28T8U, F25T8, F25T8U, F17T8 and F17T8U or 1 F40T8 lamps. Low profile housing and lightweight. High performance ballast for all general fluorescent applications. Dimensions 9.50 L x 1.16 W x 0.91 H and 8.94 M. Parallel lamp operation keeps the unit maintenance easier to manage, if one lamp fails others will stay on. Unit is thermally protected and features an internal surge protection. Sound rating of Class A. Normal ballast factor. Normal power factor. Meets FCC Part 18 (Class B) EMI and RFI consumer limits. Meets ANSI standard C82.11 for ballast requirements. Meets ANSI standard C62.41 for transient protection. UL/935 (Class P, Typ3 HL, Type 1 Outdoor) listed. cull (CSA C22.2) listed. ROHS Compliant. Maximum case temperature 167F/75C, Maximum ambient temperature 104F/40C. Minimum starting temperature 0F/-18C. Industry standards for safety and performance.