Let’s call the output in that graph 850 lumens for 2 hours or 1700 lumen-hours. That’s not quite right, but it’s going to make the math really easy when we call the battery 17 Watt-hours, which is also not quite right. 100 lm/W with an SST-40 in the 800-1000lm range is about what I’d expect from a linear driver. In this test, the emitter is making 180 lm/W at 900 lumens.
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