Philips HF-Regulator II Electronic Ballast is flat, high-frequency electronic regulating ballast, using 1-10V protocol for TL-D fluorescent lamps. The lamp power can be dimmed from 1 to 100% via the Analog control input. Compliant with European and Asian norms and suitable for emergency lighting systems. HF operation improves light quality, lamp lifetime. Combined with controls, additional energy savings can be achieved. 1-10 V installations with daylight linking and/or movement detection. 1-10 V installations with remote control systems. Installations with emergency back-up, according to IEC 60598-2-22.