Glad to pass on the info for everyone.

I've been very happy with the response time from both Schmidt Maschinebau and Supernova Lighting when I emailed with questions. Gregor Arndt at Supernova has in the past, assured me that either a serial or parallel wiring of dual Supernova E3 lamps will work on a SON28 hub and near full brightness is acheived at 9mph or above.