Discharge Lamps

Discharge Lamps

Discharge lamps are a type of electric lamp that produces light by passing an electric current through a gas or vapor. The gas or vapor is contained within a sealed glass or quartz bulb, and is ionized by the electric current, producing a plasma that emits light. Discharge lamps are known for their high efficiency and long lifespan, making them a popular choice for a variety of applications. There are several types of discharge lamps, including fluorescent lamps, metal halide lamps, and high-pressure sodium lamps. Fluorescent lamps use a low-pressure mercury vapor to produce ultraviolet light, which is then converted into visible light by a phosphorescent coating on the inside of the bulb. Metal halide lamps use a mixture of metal halides and mercury vapor to produce a bright, white light that is similar to natural daylight. High-pressure sodium lamps use sodium vapor to produce a yellowish-orange light that is often used for street lighting. One of the main advantages of discharge lamps is their high efficiency. They require less energy to produce the same amount of light as incandescent lamps, making them a more cost-effective option in the long run. Additionally, discharge lamps have a longer lifespan than incandescent lamps, which reduces the need for frequent replacements and maintenance. However, there are also some disadvantages to using discharge lamps. They require a ballast to regulate the current and voltage, which can add to the cost and complexity of the lighting system. Additionally, some types of discharge lamps, such as metal halide lamps, require a warm-up period before they reach their full brightness, which may not be suitable for applications where instant lighting is required.

electric lamp, gas, vapor, plasma, efficiency

— Andrew Nelson