👉 In electronics, a fluorescent lamp is a type of light source that emits light when exposed to an electric current. Fluorescence occurs in materials like carbon nanotubes and semiconductors, where electrons are excited by light and emit photons as a result. Fluorescent lamps use a cathode (negative terminal) that contains a sensitive material (such as tungsten or iron) and an anode (positive terminal). The cathode is exposed to the electric current from a power source