replacement of defective 400 watt hpsv lights of high mast with new 250 watt led flood lights at 220 kv substation phulpur, under electy. trans. division-i, prayagraj.-supply and fixing of 250 watt led flood light cgl / havels / bajaj / syska make in place of defective 400 watt hpsv lamp of high mast. work includes lowering of crown by pressing up button on the push button of the hoisting unit untill the intervention of the switch limiter, which lock the hoists and then press down to lower the mobile crown. after replacement of defective lights and proper connection and checking of new 250 watt led flood lights, press the up button and proceed with continuous raising untill the intervention of the switch limiter and then press the down to hook the mobile crown on the trailing head.