Jag The 900 drives the LED Helios heads on a half rectified 0 to -48V supply from their new LSC's. Regards Rob Perry Senior Engineer, Traffic Control and Systems Dorset Engineering Consultancy, Dorset County Council Pullman Court, Station Approach, Dorchester DT1 1GA Tel 01305 225357 Fax 01305 225301 Scanned by MailDefender - managed email security from intY - www.maildefender.net ----------------------------------------------------------- A message from the TCUG mailing list. For information about the list visit //www.freelists.org/webpage/tcug