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ABs are conventional voltage controlled power, like 99% of other studio flashes. They all have the fastest flash duration at Full Power, and the duration slows as you reduce power.
An AB1600 has a slower duration than an AB400 because it has larger flash capacitors, which take more time to discharge than AB400's smaller capacitors. This is true with all conventional brands, be they BUFF, Profoto, Elinchrom, etc.
Einstein™, and the new $2000 copy cat Profoto B1, use IGBT circuitry (like a giant speed light). Instead of letting the flash capacitors discharge to zero with each flash, Einstein™ shuts off the capacitors when the desired power is reached. This results in shorter and shorter durations as power reduced.
Einstein™ also has an algorithm that prevents color shift as power settings are changed, resulting in constant color temperature over the full 2.5WS to 640WS power range. All conventional units, including AB, White Lightning and the aforementioned brands share the characteristic of lower (warmer) color temperature as power is reduced from full to minimum. This shift is typically 350K to 550K over the power range.
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