Would Strobe work too?
I haven’t seen it used tro get a better idea of wht it can do.
I don’t know strobe. My question is, are you trying for random flashes of lightning or regular flashes of light? Strobe to me implies a regular and rapid off and on cycle. This is not the effect of lightning light. In nature, many times lightning will pulse a few times along the path to the ground. This is not particularly visible to the human except as a slight flicker which is usually not visible due to the glare for nearby bolts, but may be visible in more distant bolts.
If you’re trying to mimic a high speed camera that records at many hundreds or thousands of frames a second, then a strobe or oscillating tweener may be what the Dr. ordered. If you’re trying to mimic what the human eye or a normal video camera would capture, then the noise tweener would be better. If it’s only supposed to flash a couple times, then it may be just as easy to hand keyframe the off and on yourself or use the discreet tweener.