Tender For supply of sodium maintenance material. file no. 57/23x6/4.7th call. - sodium choke 150 watt (copper)- open construction eiectromagnetic ballast consisting of high quaiity silicon steel lamination with argon welding. supper enamelled copper wire. vaccum impriganated with white resin terminal block with tapping for 220/240 volts supplied suitable for street lighting applications. sodium choke isi mark 150 watt renowned make bajaj, crompton,havells,wipro or surya., igniter 70-400 watt make bajaj, crompton, havells,wipro or surya., supplying,fixing and testing of sv lamp son-t(tubular clear type) isi marked of approved make as surya. as per specification 150 watt