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Same bulb for 110-240 is nice. What's the highest power setting that stays constant at 8 and 5fps? I saw the 1/10 spec, just wondering if you had any high FPS tests.
I haven't done complete testing of this yet. Einstein will reach 100% recycle at approximately these rates:
640WS = 1.7 seconds
320WS = .85 seconds
160WS = .43 seconds
80WS = .24 seconds
40WS = .13 seconds
However, Einstein will fire before 100% charge is reached. Even if you speed fire before 100% ready, the nature of the IGBT circuitry is completely different than conventional studio flash in that the capacitors don't completely discharge with each shot so at the lower power settings, only a small portion of the capacitor charge is dissipated with each shot. Thus a fast sequence of shots - faster than the 100% recycle time, will cause much less variation in exposure and color from shot to shot as you would see in a conventional system.
For example, a shot at 1/16 power leaves about 15/16 capacitor charge, thus an immediate second shot will have most of the charge remaining and will not affect the output significantly. A long sequence of shots way before 100% recycle will result in a successive lowering of exposure as the capacitors are discharged at a faster rate than the charging circuit can keep up with. This action is similar to a speedlight set at low power.
At a guess, I would say you could expect good 5fps performance at about 1/10 power (64WS) and 8fps at about 40WS. But don't quote me yet . . . I'll try to do some tests and give you more exact info.