Sodium-vapor lamp
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A sodium-vapor lamp is a gas-discharge lamp that uses sodium in an excited state to produce light at a characteristic wavelength near 589 nm.
A high-pressure sodium street light in Toronto
A high-pressure sodium-vapor lamp
A low-pressure sodium lamp running at full brightness
Two Honda Fits under low-pressure sodium lamps. Both appear black, even though the car on the left is bright red, while the car on the right is actually black.
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