Features: Tungsten filament bulb + alkaline battery, with an electroplated iron casing. The first generation of flashlights, commonly known as "old-fashioned flashlights," typically used tungsten filament incandescent bulbs, which had low luminous efficiency, short lifespan, and were easily burned out. They used large alkaline batteries, which had a large capacity but limited battery life. The casing was made of electroplated iron, lightweight but with a simple manufacturing process.
Features: Protective gas bulb + high-performance battery. The second generation of flashlights saw a complete breakthrough in both performance and appearance. A typical example of the second generation was the use of a krypton bulb + alkaline battery, resulting in a longer bulb life and longer battery life. The casing was made of aluminum alloy with an anodized finish, resulting in a refined, beautiful, and colorful appearance with a superior texture. Another typical example was the use of a xenon bulb + lithium-ion battery, which offered a longer bulb life, significantly improved brightness, and a higher color temperature. This also introduced the concept of "tactical flashlights," opening up a new market for flashlights.
Features: Application of a new light-emitting technology-LED. The color temperature has reached an unprecedented level, approaching or even exceeding that of white light, while consuming less power. The most significant feature of the third-generation flashlight is the adoption of an LED bulb, which offers better reliability due to the inherent structure of LEDs. Lighting modes also appeared on a flashlight for the first time, and upon its release, it became widely popular.
