Hqi
HQI, often styled HQI, refers to a family of high-intensity discharge lamps used for stage, film, architectural, and outdoor lighting. In typical practice, these lamps are metal halide discharge lamps with a quartz envelope and a fill containing metal halides and mercury. They emit bright, directional light and require a ballast and starting gear to regulate current and ignition.
Construction and operation: The arc tube sits inside a quartz outer envelope. When powered, an electrical discharge
Practical considerations: HQI lamps require a suitable electronic or magnetic ballast and a reliable igniter. They
Applications and current status: HQI lamps have been widely used for theatre and film lighting, sports arenas,