Скачать или смотреть Halide Flashes from 1000W HID startup

First few seconds of ignition slowed to a minute. Mercury and metal salts being ejected from the cathode - recondensing on the walls. The dark spots will evaporate as the lamp warms. Striping video artifacts are caused by rolling shutter and high-frequency ballast. ND filter might have resolved these, but I don't care enough.

Physics observations:
1: probe-start electrode glows for a few frames before main arc strikes, as expected.
2: Right cathode is physically at the top, and ejects halides first since heat rises there. (video rotated because I do not like youtube-shorts feature)
3: Cyan discharge is due to mercury, while the muted white glow is due to penning mixture.
4: Arc begins from the base of the left electrode instead of the tip. As the electrode heats, halides vaporize as the arc moves from the base to the tip.

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