Just like to report my observations of the SP32A (the "1550 lumens max" version), which I have ordered again recently.
Looks like Sofirn makes revisions of this flashlight silently.
(the version numbers below are what I designated myself... they are not really designated at all)
v1.0 = the first SP32A that I encountered, it had a slow ramping (about 8 seconds to ramp from top to bottom or vice-versa), 2 blinks upon reaching the top or bottom of ramp (I don't have this flashlight on hand anymore)
v1.1 = this updated SP32A seems to have been around for a longer time, basically it improves the ramping speed (ramping from top to bottom or vice-versa now just takes between 4-5 seconds), 2 blinks upon reaching the top or bottom
= the lowest ramp level is a Moon mode (measured 0.001-0.002A on my DMM when ramped to lowest level), my estimate maybe 1-2 lumens
= when replacing the battery, it appears to remember the last brightness level used previously (mode memory even when removing/replacing battery)
v1.2 = I just noticed this new SP32A recently (maybe the last month or so?)
= the ramping speed is similar to v1.1 (around 4-5 seconds from top-to-bottom or bottom-to-top), but now it only registers a single blink when reaching top or bottom (this behavior is similar to the SP32A v2.0)
= the lowest ramp level is brighter than what I consider as Moon level (I measured 0.015A tailcap current with my DMM) (again this is the behavior on the SP32A v2.0, the lowest ramp brightness in SP32A v2.0 is brighter than "Moon", I haven't check what's the tailcap current on the SP32A v2.0 yet though)
= when replacing the battery (remove/insert battery), the flashlight will start at a pre-set brightness level (around 0.65A tailcap current), rather than the previous brightness level before replacing the battery (I think this is again the same behavior as the SP32A v2.0)
*although when replacing the battery, the previous brightness level seems to be "forgotten" or "reset" to the default level, but if the battery is not removed, then the SP32A has mode memory (remembers the previously brightness prior to turning off)
Also, I notice my earlier SP32A seems to have a more rosy tint, and no center hotspot mark; but in the later SP32A, it seems to be a bit more "yellowish" (corona), and the center focus appears to have a "yellow" center spot (visible when shining on a flat wall).