Lux3 vrs SSC Amp draw => What is causing the difference?

Interesting thing I noticed with some LEDs driven direct drive..
I was comparing output of my L1 Lux3 head on a E1 with RCR123 to my new Modamag 18650 (what else to do when the fiance is at a bridal show?) and noticed it was about as bright as the same head modded with SSC (Milky modded). So to investigate, I measured the current draw through both, and a gen 2 head for reference.

What I found all on the same body and 18650 cell:
L1 SSC gen 1 head = 0.7 amp
L1 SSC gen 2 head = 0.7 amp
L1 Lux3 gen 1 head = 1.1 amp

I then ran them all on the E1 with a relatively fresh 16340/RCR123 installed:
L1 SSC gen 1 = 0.54 amp
L1 SSC gen 2 = 0.49 amp
L1 Lux3 gen 1 = 0.72 amp

I knew Crees and SSC's ran with a little less amps, but this is significant with the 18650.

When using direct drive the forward voltage of the *specific* LED you have can vary greatly.

In the same reel of Cree led's you can have one that will run DD at 1amp and then the next one could be as high as 1.6amps.

Mac

The Lux3 is a UW0H Milky mod. The other SSC's (also Milky mods) are USW0H and USV0H (iirc). I knew thay had a forward voltage diff, but I guess the variation irrespective of Lux to SSC is just as much. It was weird that the two SSC had the exact same amp draw on the 18650, and that they were soooo much lower than the UW0H Lux3. 37% less

In any respect, I can expect a very nice run time for the SSC on 18650. Over 3 hours... Nice.