... stainless steel nuts. Technical parameter 1.Light source:400W-1000W High pressure sodium lamp or high pressure metal halogen lamp.2.Lighting protection ... control and microcomputer control.6.light source: 6-24*400W-1000W Sodium lamp or metal halide lamp. Application Large Squares,Stations,Ports,Airports ... ,highways,stadiums,flyovers,etc. 25m the high mast light with 400w HPS