supply of set of twin beam head light assembly , 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/ sp ec/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 capaci tor for both the converters in dc-dc converters. [ warranty period: 30 months after the date of delivery ] ]