metallic electrode arc lamp

metallic electrode arc lamp

[mə′tal·ik i¦lek‚trōd ärk ‚lamp]
(electricity)
A type of arc lamp in which light is produced by luminescent vapor introduced into the arc by evaporation from the cathode; the anode is solid copper, and the cathode is formed of magnetic iron oxide with titanium as the light-producing element and other chemicals to control steadiness and vaporization.