supply of set of twin beam head light assembly with 24v halogen lamps as per rdso specification no.elrs / spec / pr / 0024 ( rev-1 : set of twin beam head light assembly with 24v halogen lamps as per rdso specification no.elrs / spec / pr / 0024 ( rev-1 sept2004 } amendment no.1 and dc-dc converter ( 400w ) as per rdso specification no elrs / spec / dc-dc converter / 0021 { rev-1- sept-2004 } amendment no.1 for electric locomotives. set consist of 02 nos twin beam head light assembly & 01 no dc-dc converter. note: provide separate crowbar circuit with capacitor for both the converters in dc-dc converters. [ warranty period: 30 months after the date of delivery ]