Philips SI 51 220-240V 50/60Hz at the lowest prices! Fast shipping. The more you buy, the more you save! Contact us! Philips SI 51 220-240V 50/60Hz Specifications The Philips SI 51 220-240V 50/60Hz is a high voltage digital ignitor that is used specifically for HPI lamps, but cover a range of different powers: 250W-400W Where Is The Philips SI 51 220-240V 50/60HzUsed? The Philips SI 51 220-240V 50/60Hz can be used in many places. It is mainly used in outdoor lighting. The most popular application in road and tunnel lighting.