... you seem to contradict each other as a strobe "lit" duration of 1/1000 puts it within the shutter speed range? Am I right in thinking my fastest shutter is 1/8000? How do the "lit" durations vary with light emitted strength?
Strobe power is determined by the duration of the flash, except at very low power when the colour of the flash can also change. I can't find the specifications for a Subtronic strobe, but a typical flash's duration is indeed about 500 microseconds to 1millisecond. It takes a typical camera's shutter about 1/200 second to open and close, so faster shutter speeds (where both shutter curtains are moving at the same time) are incompatible with flash photography, as only a band is illuminated. In practice the only things that you can't freeze with a strobe in underwater photography are the strike of a mantis shrimp and the snap of a hungry frogfish's jaws...
... you need studio lights and a fast shutter speed or highly specialised and expensive strobe lighting to freeze a hummingbird's wings!
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