That’s with a high drain 21700. It could be a high reading…. I use the fairly standard PVC tube setup, and it’s been fairly reliable in the past.
I measure the current with a bench power supply. In this case it’d be attached to the head, not tailcap. Set the bench power to 4.2V, and see where the current falls on turbo (and other modes).
May be that with a cell things are different, and more current is going to the emitter. djozz looks to have tested this emitter (at least one specific bin) up to 9A, and the output was around 2450 lumens.
Almost anywhere in that range (ie somewhere above 7A) is just about covered by the 10% “amateur equipment” asterisk.
no battery supplies 4.2V under load and i’ve never heard of anyone powering their lights with bench supplies. No need to go through even more trouble to still get something which isn’t realistic
Djozz measures a bare emitter. In a light you have lots of loss from the reflector, lens, etc… This is why the FT03 tends to measure about 1800-1900 lumen on a high drain cell with FET driver.
Also, when a battery is under load it will not be at 4.2v. It sags down some depending on the battery used. This is why we get different amp draws depending on what battery is used.
State Action Result
Off Click Side Switch (SS) No action
Off Click Tail Switch (TS) On (Mode Memory)
On Click TS Off
On Click SS Mode Advance (LMH)
On Double Click SS Turbo
Turbo Click Previous Mode
On Triple Click SS Strobe