Result! And don't get doubts that you did the right thing buying from the guys you could talk to and are big enough to have a store. That way you get peace of mind and a decent warranty. Look forward to seeing some results in the gallery in due course!
But in the end I did order two of the 2000W stepdowns so that a. I can be comPLETEly sure it can deal with the load,
and b. when I get around to adding more lights to my kit I'll already have enough plugs for them. If that makes sense.
(Oh, and they were out of stock of the 1500W ones, so just to get on with the show and actually TAKE SOME PHOTOS soon, I
grabbed the best available!) So, happy for now