Light fixture is powered on and running — watch for heat and burns. On set: "That HMI is hot, don't touch."
When you hear "the HMI is hot" on set, it means: hands off. The lamp is running, generates extreme heat, and can burn you — in the worst case, second-degree burns in seconds. This is not hyperbole, but everyday reality when dealing with large lighting fixtures. A 2.5 kW HMI lamp quickly reaches 800–1000 °C on its surface during operation. The glass, the socket, even the immediate surroundings become a danger zone.
Safety is not an option, but protocol. Everyone on set must know which lights are currently "hot." The gaffer or the lighting assistant will inform you before lamps are powered up. As long as a fixture is running, a safety radius remains around it — at least an arm's length. Never lay a cable near a hot lamp, never reposition a spotlight blindly. When you're rigging, you sometimes reposition hot lamps after the shoot is over — but only after they've cooled down, which can take 10–20 minutes.
The practical rule of thumb: After switching off, wait at least five minutes before touching a fixture. Even better: wear gloves or use a wooden grip — this is standard on professional sets. Fresnel and profile spotlights are particularly tricky, as the heat radiates downwards: the lamp head itself is super hot, but the housing below is barely warmer. Beginners often grab there and burn their fingers and palms. Some sets work with "cool-down zones" — designated areas where hot fixtures can be placed after use.
Important: "Hot" also refers to the power supply. A hot circuit with current under load is just as dangerous as being thermally hot. That's why some electricians also say "hot" for live. Always think in the respective context. While you can work while a lamp is hot — unplugging, changing gels, readjusting — it requires respect. A burning HMI is not a toy, and set etiquette demands that you announce yourself when approaching a hot lamp.