Hi,
my apologies, the quote came from the clipboard of my PC, and its unrelated to this thread.

Just to clarify, if the drivers are rated at 70V, then why not use 70V?. If you intentionlally use a lesser voltage then you are tacitly saying:
'these are cheap Chinese drivers and I'm going to de-rate them because I don't believe the rating'. If you are of that opinion don't buy them!
Buy Geckos and be done with it.

Craig