Rapid are trying to stop delivery of previous order, and I need to order the correct item.

So, it is the view of the committee that I should get a 50V transformer (nominal off-load 70V DC) or drop to 45V (nominal off-load 63V DC)? I'm currently using drivers rated at 75V but shortly moving to 80V EM806. Would the lower voltage be noticeable in practice? It's certainly the safer option but I don't have enough experience of these things to know whether this will matter.