previously owned that LL light (i think it was my second LED flashlight). some years ago converted it to a homemade headlamp. since died and received and honorable burial befitting its years of fine service.
Streamlight makes an inexpensive 3N ProPolymer light which i currently own. SL claims 12lm for max brightness on fresh cells - seems like a quite reasonable claim to me based upon the amount of light i see it putting out. if they had claimed 15lm, i wouldn't disagree based upon the performance of my particular unit.
quite bright. brighter than several 2xAAA lights that i own (though i don't certainly have experience with every type of 2xAAA light in existence). i've compared side-by-side with 2xAAA lights and penlights from UK, Pelican and Streamlight. the SL 3N ProPolymer is noticeably brighter than the several 2xAAA lights that i've compared it to. sorry, no light meter - just "eyeball". haven't done any burntime testing either. please keep in mind that i've obviously only tested just one unit of each type of light and maybe my SL 3N PP is a "hot" performer and, therefore, not typical of the average 3N PP???
didn't own the LL and Streamlight lights at the same time, so i've never compared them.
as others have already stated, decent_brightness+small_power_source = shorter runtimes (don't ask -- i've never timed it).
Greg over at BrightGuy.com sells the Streamlight ProPolymer 3N LED flashlight (currently on sale there <$17USD). Didn't see it being sold on MattK's website.