A discharge lamp is a light source that produces illumination when an electrical current excites gas particles contained within a glass tube, causing them to emit light. Common examples include electronic flashes, neon lights, and certain studio or stage lighting systems.
In photography, discharge lamps-especially electronic flashes-provide intense, short bursts of light that allow photographers to freeze motion, illuminate subjects in low-light conditions, or create controlled lighting effects. Understanding how discharge lamps work helps photographers optimise exposure, colour balance, and lighting techniques in both studio and field environments.