HEAD LAMP Suitable for GB3836.1,2,3-2000 ,IEC60079 standard request. ... explosive atmosphere.2.With incandescent lamp ,mercury lamp,high-pressure sodium lamp,metal halide lamp.3.Can be matched with lamp dome reflector.FeaturesDiecasted aluminium ... diameter(Φ,mm)Inlet's thread(G")Lamp socketE-markBCD-250IP56,WF110-14 3/4E27ExedIIBT4Supplied with light sourceLamp voltage Self-ballasted mercury vapor ...