Highhorse Metal Halide ballasts. Fulham - Highhorse electronic (20 watt to 100 watt). Constant power & light, enhanced color uniformity, wide lamp compatibility, improved lumen maintenance, longer lamp life, energy saving, small, one-piece design, lower operating costs. Specifications for all Highhorse ballasts - Frequency: 50/60 Hz, ATHD: <10%, Protection/voltage Transients: MOV (Per ANSI C82.11-1933 & C.62.41), EMI/RFI: FCC 18-A, Approvals UL, cUL, Complies with UL1029 Type 1 outdoors, suitable for recessed use, High Power Factor: >.98, Min. Operating Temp: -20 Degrees F (-30 Degrees C), Max. Case Temp.: 158 Degrees F (80 Degrees C), Class P: Thermal, Sound Rating A.