Metal-halide lamp
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A metal-halide lamp is an electrical lamp that produces light by an electric arc through a gaseous mixture of vaporized mercury and metal halides. It is a type of high-intensity discharge gas discharg
Metal halide lamp with arc tube shield, for open fixtures
Metal halide floodlights at a baseball field
Metal halide lamp for automotive headlights
Metal halide lamps were invented by Charles Proteus Steinmetz in 1912 and are now used in almost every city in the world.
Neon lamp
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A neon lamp is a miniature gas-discharge lamp. The lamp typically consists of a small glass capsule that contains a mixture of neon and other gases at a low pressure and two electrodes. When sufficien
NE-2 type neon lamp powered by alternating current (AC)
A General Electric NE-34 glow lamp, manufactured circa 1930
Switch on a power strip, illuminated by a neon lamp
+DC (left), -DC (center), AC (right) supplied to NE-2 type neon lamps