Gas-discharge lamp
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Gas-discharge lamps are a family of artificial light sources that generate light by sending an electric discharge through an ionized gas, a plasma.
Germicidal lamps are simple low-pressure mercury vapor discharges in a fused quartz envelope.
Jules Verne's "Ruhmkorff lamp"
A compact fluorescent lamp
15 kW xenon short-arc lamp used in IMAX projectors
Noble gas
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The noble gases are the naturally occurring members of group 18 of the periodic table: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). Under standard conditions, these elements are odorless, colorless, monatomic gases with very low chemical reactivity and cryogenic boiling points.
Image: Helium discharge tube
Image: Neon discharge tube
Image: Argon discharge tube
Image: Krypton discharge tube