It took 32 days to get here, but arrive it did (
this one). In case anyone is interested, there are three LEDs inside. They are in series, 1.18 A runs through each one, Vf = 1.8V each for total 5.4 V, so total power into LEDs is 1.18 * 5.4 = 6.4 watts. Almost the entire interior volume is one large cylindrical heatsink. External DC power draw is 0.71 A at 12.0 V or 8.5 W, so the internal DC-DC step-down converter is 75% efficient. The LEDs have integral 60-degree lenses, that combines with the external lenses on the front face to make the beam.
I would like to find those single-die 1.2-amp 850nm LEDs sold separately, but I haven't seen them. If it was the common 700 mA type being run really hard, I'd expect a higher Vf.
EDIT: Well now, I take that back. I tried out one of these (850nm on heatsink)
3W Infrared IR 850nm 940nm 60 90 140degree Chip High Power LED Emitter with | eBay at 1.18 A and measured Vf = 1.65 V so it's even lower. But they spec 700 mA and ebay is hardly known for understating the spec. I wonder how long I can get away with that current.