halogeenilähteiden

Halogeenilähteiden, often translated as halogen lamps or halogen bulbs, are a type of incandescent light source. They are a refined version of the standard incandescent bulb, offering improved efficiency and lifespan. The key difference lies in the addition of a small amount of a halogen gas, such as iodine or bromine, within the bulb's envelope.

The principle of operation involves a filament, typically made of tungsten, which heats up and emits light when an electric current passes through it. In a standard incandescent bulb, tungsten atoms that evaporate from the filament deposit on the cooler glass envelope, causing the filament to thin over time and eventually break, leading to bulb failure. Halogen lamps mitigate this by employing a halogen cycle.

The halogen gas reacts with the evaporated tungsten atoms, forming a gaseous tungsten halide compound. When this compound comes into contact with the hot filament, the high temperature causes it to decompose, redepositing the tungsten back onto the filament. This regenerative process significantly slows down filament degradation, allowing the bulb to operate at higher temperatures, which in turn leads to brighter light and a more efficient conversion of electrical energy into visible light compared to traditional incandescent bulbs. Halogen lamps are known for their warm, white light and are commonly used in applications where good color rendering is important, such as in spotlights, automotive headlights, and some household lighting.