Mercury-vapor Lamps

Mercury-vapor Lamps

Mercury-vapor lamps are a type of gas-discharge lamp that produce light by passing an electric current through a mixture of mercury vapor and an inert gas, such as argon or neon. The lamp consists of a sealed glass bulb that contains the gas mixture, two electrodes, and a small amount of mercury. When the lamp is turned on, an electric current flows between the electrodes, ionizing the gas and causing the mercury atoms to emit ultraviolet light. The ultraviolet light is then absorbed by a phosphor coating on the inside of the bulb, which converts it into visible light. Mercury-vapor lamps are commonly used in outdoor lighting applications, such as streetlights and parking lot lights, as well as in industrial and commercial settings where high-intensity lighting is required. They are known for their high efficiency and long lifespan, with some lamps lasting up to 24,000 hours. However, they also have some drawbacks, including a slow warm-up time and the fact that they contain toxic mercury, which can be harmful to the environment if not disposed of properly. Despite these drawbacks, mercury-vapor lamps remain a popular choice for outdoor and industrial lighting due to their high efficiency and long lifespan. They are also used in some scientific and medical applications, such as fluorescence microscopy and UV sterilization.

gas-discharge lamp, ultraviolet light, phosphor coating, efficiency, lifespan

— Brian Johnson

CITATION : "Brian Johnson. 'Mercury-vapor Lamps.' Design+Encyclopedia. https://design-encyclopedia.com/define/mercury-vapor-lamps-293901?E=293901 (Accessed on October 14, 2026)"