Yeah probably being a wee bit to harsh on them with this one, but they just annoy me so much now, especially as Reynolds seems to be getting worse with his patter.
While I agree with what you're saying, about 1/2 lit room or daylight and complete darkness, I have to disagree a wee bit with the bolded part, often Reynolds will say similar, ie this is exactly how it will look on your bedside cabinet in the middle of the night, etc. My watches with GTLS tubes never look as bright as those in the demos. And there's a simple reason for that, contrary to what Reynolds says, that they use the UV torch to excite the tritium in the tubes, the tritium in the tubes plays no part in the UV demo it's actually a reaction between the Phosphor in the tubes and UV light that is occurring, and that gives off a far brighter light, than the light given off in the reaction that normally occurs in GTLS tubes (which can be seen in the dark), ie when you have the Tritium/Phosphor reaction.
Now if they said we are using the torch to give you a rough idea as to how the tubes will glow in the dark, but obviously they won't glow as brightly, then fine, but he doesn't say that.
And this is why I 'm not a fan of the UV demo without the right caveat added, it's doesn't give a true representation of how it will look, yeah you can see them in complete darkness and read time up to approx 3/4 feet, but they are not as bright as the demo in studio makes them appear, also the UV light illuminates/makes visible stuff on the dial/watch you're never going to see in complete darkness.