The original SP33 v1 "2500" lumens (XHP50.2 6volt LED) will have a tailcap current of 6 Amps on Turbo, no higher. <= this will be a good identifier for the older SP33.
The SP33 v2 (XHP50.2 "3000" lumens) will have around 8-10 Amps on Turbo (tail current from what I remember, will find my notes...)
The SP33 v3 (XHP50.2 "3500" lumens) will have higher than 10 Amps (probably 12-13+) tailcap current on Turbo, based on my measurements with a fully-charged 26650 battery (UT210E clamp meter) (tail current from what I remember, will find my notes)
Also, using the Zak.Wilson's "CeilingBounce" app and measuring the "ceiling bounce" (sorry I don't have a light integrating device as this time), gives the following graphs, which show different thermal control.
Ah, ok. They were all XHP50.2's. Thanx! I had been planning to swap in 3 channel drivers that CK designed here: https://budgetlightforum.com/t/-/55051, but never got around to it.
I believe these boards will work on all SP33 models, appears nothing changed in the basic driver layout, though not sure, haven't confirmed.
Interesting fyi, I added 22 AWG wire bypasses on the springs (short ones in the center of the spring), and got ~ 25% boost in lumens and candela.
Measuring amps at the tail, on a charged up 40T the amps went up from 14.7A to 16.5A, but that's only seeing the bump of the bypass on the driver side because my amp measurements are with the tailcap off. I did the before/after tests with both a 40T cell and a red Dolidada 5500 26650 and saw about the same percent bump. These springs are not high performance, accept maybe for their thickness but they are not low resistance.
We've been get'n spoiled on the high qual springs and double springs in our lights as of late - these are standard springs. I'd be worried about melting them with a good cell without bypasses.
Confirmed - went from 2200 lm in kit spec (kit 26650 and everything out of the box) to 2820 lm with bypass (2x 22awg twisted ends, soldered to spring).
On the driver side I’d do my best to do it on the inside (would spend more time on it than I did), but for the tailcap side, it’s all one slab of metal so I figured it was fine for the outside.
It’s unfortunate that “3500” ended up being 2200, though.