[Noctem]

What was the lighting setup like for the demo videos? Did you do any processing to reduce flicker?

I get a lot of flickering from CFL and incandescent bulbs in my 240 FPS videos, though I’ve had better results with some LEDs. Considering how much light I’ve needed for good videos at 240 FPS, I’d imagine the lighting requirements at 660-1000 are fairly immense.

[robertelder]

Usually, I would try to wait until evening when the sunlight shines directly into my apartment. Firlming under a 60 watt lamp was still quite dark. I didn't do any experiments with post-processing to reduce flicker, but I know there some advanced video editors do provide such features.

[HermannSW]

Easiest way to avoid flicker is to light the scene with 1000lm or 5000lm cheap leds with led driver (they power the led with 38V/1.5A DC for 5000lm). Total cost of led+driver is less than 9$ with free shipping on aliexpress.