I think the largest reason for the numbers was actually not that the numbers were wrong but the emitters were wrong. Up till recently I have been collecting parts but kept waiting for the TA drivers to be finished, then TK to update the firmware and finally for the funds to actually build them.
A lot of the lights I have built so far had LED’s from “sketchy” suppliers, My guess is that the bins were not correct in them (big part of why I didn’t want to test them and base results off those numbers).
I have been building a LOT of S2+’s this week with various setups, here is a random sampling of numbers from them to give an idea. These LED’s I am sure are genuine bins but they are committed to gift lights so I didn’t want to risk messing them up.
Oh, the numbers from my test actually line up perfectly with the Cree data sheet when I compared them via http://pct.cree.com/dt/index.html
219C 4000k 90+ CRI D240 from group buy
350ma = 140 lm
2.45 = 740 lm
XP-L HI V2 3D (the best throwing S2+ I have with a TIR)from IOS
350ma = 170 lm
2.45 = 1000 lm
XP-G3 5700K 90+ CRI from Arrow, not highest bin
350ma = 193 lm
2.45 = 930 lm
XP-L2 5000k V5 from mouser
350ma = 200 lm
2.45A = 1150 lm
So with known bin emitters the jump is not as much as I originally thought, It seems that fasttech and others can’t be trusted with their bins :person_facepalming:
I should have noted where the other LED’s came from.
The biggest change is what happens when you keep pressing the LED and the fact it can pull a lot more power from the cells, even cheap laptop cells can give nice output.
single cell buck drivers would also make a fair amount of sense with these LED’s.