I own a gen 177, a rep of the 318L and another rep of the 288K.
The 177 is just a bit brighter (10% more maybe) than the other 2 after exposure to sunlight (wether it's for 30sec or 30min), I believe that it's due to the sandwich dial...
After 1 or 2 hours, the difference is the same, the 177 is a bit brighter, but the lume on the other 2 is equivalent...
After an 8 hours night the 177 still glow like a torch while the other 2 glow much less.
But still after a night I'd say that the 318 and the 288 glow more than a standard rep lume, that you would have taken to sun light for 10min.
Both of those rep are really impressive and very equivalent lume wise.