I checked once more the purple Efest, extra topped up on the charger now (first measurement was with a few days rested battery), and it helps a bit: 540 lumen at 3 seconds, 520 lumen at 30 seconds.

And I could not resist this pic, I will add that including li-ion batteries the Blitzwolff is 89 gram, the D4 112 gram. I will spare the Blitzwolf any further comparisons :smiley: