The z330 now has a warning sticker in the box that tells you. That if u fire (more then) 10 flashes... U have to wait 5 min before firing again
This is very interesting and there was certainly no such notice with the strobes supplied for this review. Could you take a picture of it?
I can state that I have seriously violated this guideline repeatedly and there has been no obvious negative effect on the Z330s or their performance! I did 4 back to back battery tests of the strobes, cycling at full power soon as the ready light appeared... that's around 1000 flashes with no break in between!
In terms of guide numbers, I think we should, in this instance, perhaps simply look at them as a non specific and hence fairly generic way of comparing strobe output. As mentioned, I was quoting manufacturers specifications, which (I think) did not list units.
I note that the unit is Ws rather then W/s and thank you for this correction.