Ljósaperu

Ljósaperu is the Icelandic word for light bulb. A light bulb, or electric lamp, is a device that produces light when an electric current is passed through it. The most common type of light bulb historically has been the incandescent bulb, which works by heating a thin filament, usually made of tungsten, until it glows. This filament is enclosed in a glass bulb that is often filled with an inert gas or a vacuum to prevent oxidation.

Over time, advancements in lighting technology have led to more energy-efficient alternatives. Fluorescent lamps, for example, use electricity to excite mercury vapor, which then produces ultraviolet light that causes a fluorescent coating on the inside of the bulb to emit visible light. Light-emitting diodes (LEDs) represent a more recent and highly efficient technology. LEDs produce light through electroluminescence, where a semiconductor material emits light when an electric current passes through it. These bulbs are known for their longevity and low energy consumption, gradually replacing older incandescent and fluorescent types in many applications worldwide. The term ljósaperu in Icelandic encompasses all these forms of electric lighting.