The L0D is one of fenix's previous gen AAA lights. It had a luxeon I or III led in it i believe and was digitally regulated hence where the "D" came from? it also came in a cree led version when those first came out a few years back.
Before that there was also a L0P(which i have somewhere in the house) which wasnt regulated or at least not very well.
The L1 was fenix's first flashlight i believe, running on single AA, the L1+ was an updated version of it i think? Then came the L1P(which was my first quality led light), where the "P" is for premium, they also had the 2 AA version being the L2P which came out at the same time.
They also had the P line which used cr123s, P1 being the original.
L0P > L0D > LD01
L1 > L1P > L1D > LD10
P1 > P1D > PD10
Their naming system hasnt changed all that much for each generation of lights, though theyve added a few more other lines!
As for the red christmas edition that was available for 1 or 2 years which came in a free wooden gift box i think...
And titanium wouldve been a special limited edition for those wanting...well titanium!
