sodium-vapour lamp
Definition
Noun: - A type of electric lamp that produces a characteristic yellow light by passing an electric current through a tube containing sodium vapor. It is commonly used for street lighting and other outdoor illumination due to its high efficiency and long life.
Usage
- Primary Use: Describing a specific technology for generating light, particularly in public and industrial settings.
- The city council decided to replace all the old streetlights with modern sodium-vapour lamps.
- The orange glow of the sodium-vapour lamp made the empty parking lot look eerie.
Advanced Usage
- Technical Context: Often discussed in terms of energy efficiency, light pollution, or the color rendering index (CRI), as sodium-vapour lamps emit light in a narrow spectrum.
- Astronomers often criticize sodium-vapour lamps for their contribution to skyglow, which interferes with observations.
Variants and Related Words
- Sodium-vapor lamp (noun): An alternative spelling, primarily used in American English.
- Sodium lamp (noun): A common shortened form.
- High-pressure sodium lamp (noun): A more efficient and brighter variant of the standard low-pressure sodium-vapour lamp.
- Gas-discharge lamp (noun): The broader category of lamps to which sodium-vapour lamps belong.
Synonyms
- Sodium lamp
- Sodium-vapor lamp (US spelling)
Notes on Meaning
- The term specifically refers to the lamp's technology and its distinctive yellow light. It is not used metaphorically. The primary association is with functional, public-area lighting rather than domestic or decorative lighting.
Noun
-
lamp in which an electric current passed through a tube of sodium vapor makes a yellow light; used is street lighting
Khám phá thêm
Các từ liên quan
Từ đồng nghĩa
Từ gần giống
