High-Pressure Sodium (HPS) lamps 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 affect color perception in illuminated areas. HPS lamps operate at high pressure, which allows them to generate more light with less energy compared to traditional incandescent bulbs. They are often used in outdoor settings due to their ability to illuminate large areas effectively while consuming less electricity.