I refer to my posting at 10:46 above.
Immediately after the above posting, I went out for a 40-min walk in suburban forested area to try out my FD20,
here are my impressions after the maiden usage:
Setup:
I had in one hand my FD30 and the other my FD20.
On my FD30 I set brightness to level 4 High 350 lumen and FD20 set at level 4 Turbo 350 lumen. Fixed both lights at Full Throw.
How does my FD20 compare to my FD30:
1) FD20 matches the FD30 in brightness
2) center hotspot intensity = wow, both similar
3) Spill = wow, spills from both lights are similar and very useable
4) Range = another wow, FD20's claimed 115 meters throw is quite true (off course dimly lit down range)
After the maiden usage, I have to admit and say, I AM Impressed with the FD20 for it being only powered by 2x AA batteries.
Fenix only claimed 350 lumen max, but it seems brighter.
As an end-user, my feedback to Fenix for the FD20:
a) Neutral white LED
b) Clip (like that found on the LD22-2015)
my personal preference among my FD-series lights are (FD40, FD41, FD30 and FD20):
a) FD40 = for its 26650 long runtimes (but limited by the outdated timer program) and for the FD40's IMO very smooth very wide angle Full Flood at max output.
b) FD41 = I really liked my FD41's Full Throw at max output and for it having Temperature control I almost always use this light at max level.
c) FD30 = I have grown to really like my FD30's more neutral tint, for its versatility and handy to carry around as a flood light with ability to zoom.
d) FD20 = ok, this one seems to be duplicating my FD30's role. FD20's Full Flood is not as clean or as smooth. This light would make a good back-up AA-alkaline/1.5v lithium light.
What I would like to see Fenix make in the near future:
(i) Focus ring IP68-rated and temperature controlled Headlamp series
(ii) Focus ring IP68-rated and temperature controlled high-lumen series that has a zoom range from General purpose (TK47UE) lighting to Throw (TK47)
Wow I dream a bit too far. But hey Fenix, don't fall a sleep .