I was told today that any two different brands of studio strobes each
rated at 400 watts / second [or any other rating for that matter] might
not deliver the same intensity of light output. By way of analogy my
source said that in and of itself any particular strobe rating was like
saying that an automobile's engine had four, or five, or six cylinders
and so many valves but did not imply or specify the actual power output
other than suggest, for example, that a 800 w/s rating was likely to be
twice as intense as a 400 w/s rating.
Can any one out there explain just how you measure the intensity of
light output by reference to the watt per second rating and how this can
be converted into a guide number for any particular ISO film speed?
John Hudson
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