Mode in that table refers to the output current, through all 3 emiters. The lumens will depend on the emitter, but most LED’s will be in the same general ballpark. I will refer to djozz’s data for the 519A, dome-on, as adjusted by thefreeman.
The lowest current tested was 0.5A. While the output curve is not linear, there are two competing effects at lower currents that make me reasonably comfortable simply approximating output at 1/5th of the value at that current as if it were linear:
- The LED becomes more efficient (lm/W) as the current drops
- The forward voltage drops (and therefore also the consumed W) as the current drops.
On that basis, and assuming 90% transmission through the optics, I estimate 98 lumens.