Okay I charged the cells last night, but didn't know when to take them off the charger. Charged them for maybe 3hours. Checked the battery temp this morning and it reads out 4.5v. Is that too high? I'm not sure if certain cells peak at 4.5v as opposed to the 4.2v, hopefully it's not overcharged.
Checked the light's current temp (23c) and its temp limit (71c).
Ran turbo until stepdown, which occurred at 2:30, then checked temp after, which was 81c. The light cooled down to 40c in a matter of 90 seconds or so. Battery voltage was still 4.5v afterwards.
Ran the light again, this time its starting temp was 40c. It stepped down from turbo at around 2 mins, then stepped down again to a much lower output (<~500 lumens-- probably the level of its highest regulated output) at about 3 minutes in. Temp afterwards was read again at 81c.
Later on, I ran the light at maybe at about maybe 80-90% of the way up the ramp, so a little under turbo. The light had a subtle stepdown at around 3 minutes again, but then it seemed to level out at around 1500- 2000 lumens, doing very slight up and down steps to keep its temp regulated. I'm thinking the 2300 lumen output and 420kcd is with this 80% or so ramp Vinh, after the light initially stepped down for you. The light is probably closer to 3000-3500 lumen and 500kcd at its highest output, but the problem is it gets hot too quickly, so it won't be able to sustain 2000 lumen output after that, and has to step down to below 1000 lumens. If it starts at around 2000 lumens, it is able to maintain somewhere around 1000-1500 lumens continuously.
It's good to have both options, but it's too bad the D4 ramping software doesn't have a little blip around that 2000 lumen output, you kinda gotta guess at it. It's too bad I don't have any measuring equipment to actually graph the output over time.
After 20 minutes of constant output at what I'm guessing is 1000-1500 lumens, the battery pack went from 4.3v down to 4.2v, and the light was at around 65c.