That remined me that have an old junkshop 7 LED torch, but after testing it wasn’t that bright. I also have a new COB torch which is bright, but if phosphor has lag it’s probably not ideal.
The circuit runs on 12V and only has a 10 ohm resistor, so I guess it’s already using a low duty cycle.
It’s hard to see in the video because the frame rate doesn’t match the strobe - eye was clearer - , but the Xenon TL showed the mark a touch below the dot on the VR sensor. The LED on the other hand was very close, but the problem is it showed 2 marks. One mark looked on the right spot, but the other looked about another 10º retarded - the vid kind-of shows the 2 marks -. Because it uses a wire wrapped around an ignition lead it must be retriggering with flyback. If you use the most advanced flash it should be good enough.
I’m going to try more LEDs, the 10mm LEDs, and I see if the COB has lag, when they get here.