I just got off the phone with Ball USA, and I want to clarify what has been said here:
The T25 or T100 designation has to do with THE TOTAL AMOUNT OF MILLICURIES/RADIATION IN THE WATCH. It is only indirectly related to the number of tubes or size of the tubes. I don't know exactly how they measure this, whether it is on a Geiger counter or by the amount of gas or what. But the "T number" may not relate directly to perceived brightness.
Thus the EMII Ltd Edition is T25 and looks just as bright as the Arabic Chronometer with the T100 designation. The Arabic has a few more tubes, which probably puts it over the top in this case. Perceived brightness is not necessarily any greater, and T100 does not absolutely mean it has 100 of anything, just more than T25. So a "T100" watch could REALLY be T26. Just more than T25. Apparently T100 is some sort of upper limit, at least as to what can be imported. Yes, some longer and wider tubes are brighter, without a doubt. But the T designation is as to the TOTAL watch, not a measure of how bright any individual tubes may be.
BTW, the rep advised me that the NightTrain could show up soon, or as late as Christmas. They are not sure.