This is interesting. I was thinking last night that the difference between the major brands might be more a case study in marketing techniques than any real engineering difference.
Not too long ago, a thread I posted over on TFL asked whether or not vendors of night sights can replace the tritium tubes used, or if we users get smacked another ~$100 for a new set. Tucked in among the answers that came back, was an explanation that the Nuclear Regulatory Agency keeps a pretty tight lid on who has access to tritium, since it could conceivably be used for pretty serious business, if it were to fall into the wrong hands.
So, I've been tinkering with a theory. Apparrently, it seems only a handful of companies can make these little glowing ampuoles, and Trijicon is one of them. To confirm that this is the case, if you take a look at a Heine, Ashley or PT site, you will probably find the Trijicon trademark on there.
Ok, so for arguement's sake, say I'm right, and Trijicon is the sole supplier of those little glowing bulbs. Wouldn't that mean that if all the little glowing bulbs are the same, then the only difference from one brand of nite site to another is the shape/design of them, and how they're assembled?
Trijicon's angle is the sapphire lens that seals the capsule.
Meprolight's angle is that they're supposed to be brighter.
PT's angle is...
and so on...
So, is this just a case of the difference between 'store brand' Ketchup and Heinz? IOW, the same stuff is in the bottle, but the packaging is just different?