So what (grin) resistor should i use for this LED then? :D

Osgeld:

And bull, any led will dim just by using it, now if its abused it will crap out much quicker than one kept in absolute perfect conditions, but it will still dim

ok, so if i set a spare regulator to a a mid range level until it reads say 15ma, i'll leave it at 2.1v or 2.3v or whatever it is, i'll have an identical one to that i wont touch (only to power it up once to compare brightness), and i'll leave it on for a week and i'll take a before and after picture... don't expect me to do it right now, but I will tomorrow... and i'll see how much visible differences they are