There were at least two versions of the original Night Train - "universal military time" and "universal coordinated time". Within those there are at least two lume schemes - tricolor and bicolor. The T100 vs T is not a bad sign - Ball has used both (and they mean the same thing - 26-100 mCi of radiation)
I've got the rare Gen I Night Train with the "UTC" dial and the awesome tri color lume- it was one of the first Ball models to have blue tubes which has now become more commonplace on their newer models.
The pictured "UMT" dial has mostly green tubes with just one red tube at the 12 o'clock position.
It is much brighter, though, with the mostly green tubes.
Ok, so I was poking around the forum and there's actually a really nice photo comparison between the first generation and second generation Night Trains right here in our photo gallery. The mostly green tubes on the newer Night Trains do appear to be brighter as green is the most visible color to the human eye so I've been told. For me, though, the blue tubes are just too cool! Ha ha ha
It's true. Green is the easiest color for the eye to detect at night, and you can prove it to yourself. Tonight, go and find some traffic signal lights that are about one mile away from you. You will be able to see the green signal light much easier than the red signal light.
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