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Well, I had a bad night's sleep last night and I can tell you I was pretty impressed with my lume! It was certainly still easily readable some 5 or 6 hours after being exposed to ordinary domestic lighting (ie no blasting with my UV torch!)
Also I noticed that when I break out the telescope and I am fully dark-adjusted, again, I can read the time easily for as many hours I am out observing.
So, wearas I would much prefer the original Radium lume ((in preference to tritium), this is pretty much good enough. Never really paid attention to the lume until last night!
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