"For your first point, I disagree. The double click/click hold system is very efficient. Second, as I just learned, you CAN do momentary in ANY mode! See the quoted post above yours in my post."
I won't say it's not efficient; put it down to an aging brain, maybe, but I can't remember how it works if I haven't used it for a while, and while I can get about thelight level I want ramping down I can't when ramping up. It seems counterintuitive and persnickity to me -- I have to struggle with it. As I said, though, some people DO like it a lot.
I'm still waiting to see someone come out with a side sliding switch to give different levels, like a sliding volume control. (Hint, hint, to manufactureres.)
As to the question of whether a thing is the same after parts being replaced, I'd say that 'identity' is a matter of mind and thought -- and perception. If you can't tell the difference than a thing is effectively the same as it always was (or identical to something else, like two eggs might not be the same, but if you lay them on the counter and then can't tell which you put where, they are, effectively, the same thing).
As such, if a light has been modded so it works differently, then thay may be similar, or variations, but not identical. If you replace a bulb, cell, switch, etc., and can't tell any difference, then it's the same light: while playing with the idea of some 'invisible essence' might be fun, it doesn't count for anything in practice. You can argue that a thing is different than it was a millisecond before, since the quantum states and positions of atos and such have moved, but that defeats the concept of 'identity', which is an idea concerning continuity over time and space. Hence, my criteria for a thing maintaining identity is 'how could you -- can you -- tell the difference?'.
