High-pressure sodium lamps (HPS) are a type of gas discharge lamp that produces light by passing an electric current through sodium vapor. They are known for their efficiency and long lifespan, making them popular for street lighting and industrial applications. The light emitted has a characteristic yellow-orange hue, which can enhance visibility in outdoor settings. These lamps operate at high pressure, which allows them to generate a brighter light compared to low-pressure sodium lamps. HPS lamps are often used in agriculture for growing plants, as they provide a spectrum of light that promotes photosynthesis.