Have not needed to deal with SF re QC issues, but I have my L2 with me as we speak and cannot detect any trace of a doughnut hole, on walls at any range - and y'all can hunt them white walls here in Georgia!
I believe that this particular light has the best color quality of any LED that I own. As a side note, some folks (maybe a lot!) buy this for its output on the high level, but after going through my first set of batteries having occasional fun lighting up an entire valley on walks in the woods, the novelty wore off and I believe I haven't used that setting more than a few times, for a few seconds. Nice to know it's there, but the (approx.) 16 lumens on low is just about perfect for most real-world things I do, if not too much.
-Bill