High-intensity gas discharge lamp — daylight-balanced, flicker-free spectrum, punches through any reflector. Old-school but unbeatable for hard key light.
You need the sun but are 300 lux short and have no second day for shooting? Then the Xenon arc light comes into play — a gas-discharge lamp that ignites xenon gas between two electrodes in a quartz glass chamber. The result: extremely high light intensity, a cool, neutral color temperature (around 5600K), and a continuous spectrum that looks remarkably similar to natural daylight. Unlike halogen or LED, there are no annoying color casts, no PWM flicker that can become a problem later in the edit.
The practical strength lies in brightness per wattage — a 6kW Xenon arc light provides you with light levels like the sun on a cloudy day, and that continuously, without pulsing. On set, you notice it immediately: the grip needs fewer fill lights, depth of field remains controllable, and you save on gels and diffusion. Especially interesting for high-speed shots — while LEDs tend to flicker quickly at higher frame rates, Xenon runs cleanly.
The downside? Xenon arc lights are industrial equipment from another era. They require special electronic ballasts, are susceptible to vibration and shock (the bulb itself costs around 200 Euros), and your power distribution must handle the load. There's a loud bang when igniting — not ideal if sound is running concurrently. The heat development is also considerable; the lamp needs active cooling, so the unit requires a separate power line and a fan.
Where are Xenon arc lights still used today? Mainly in high-speed cinema (slow-motion at 500+ fps), where flicker-free continuous lighting is non-negotiable. Some documentary teams also use them for extreme day-for-night scenes outdoors because the light remains so precise and unadulterated. In most modern productions, LED technology has displaced Xenon — LED is quieter, cooler, and more flexible in color control. But anyone who has worked with a good Xenon bank knows: there's simply an optical difference, a clarity and depth that digital sources find hard to replicate.