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Some won't like this but the best definition of WS and Lumens is found on Paul C Buff. He clears up a few things for me. If you disagree, please tell us why. http://www.paulcbuff.com/sfe-unitsofmeasure.php
He rates his Einsteins at 28,000 lumen seconds, which I believe is close to the 25,000 Lumens of a Press 25. Which may mean with a same type and size reflector they produce the same amount of flash light power , but with different color temp and duration. http://www.paulcbuff.com/e640.php
This gives me something to test, I can pop a strobe and a single P25 and expose both DSLR and film at similar ISO and see what I get.
Soon this will happen.
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