WordNet
n. lamp in which an electric current passed through a tube of sodium vapor makes a yellow light; used is street lighting [syn: sodium-vapour lamp]
Wikipedia
A sodium-vapor lamp is a gas-discharge lamp that uses sodium in an excited state to produce light. There are two varieties of such lamps: low pressure and high pressure. Low-pressure sodium lamps are highly efficient electrical light sources, but their yellow light restricts applications to outdoor lighting such as street lamps. High-pressure sodium lamps have a broader spectrum of light than the low-pressure lamps, but still poorer color rendering than other types of lamps. Low-pressure sodium lamps only give monochromatic yellow light and so inhibit color vision at night.
Usage examples of "sodium-vapor lamp".
He squinted up at Yama as they passed through the orange glow of a sodium-vapor lamp.
They were standing at the edge of a pool of light cast by a twenty-foot-high sodium-vapor lamp.