With the Mule head it´s around 10CM. = 4"..
Output is stated to above 1100 lumen..
It ought to drop fast and be steady at 800 for an hour..
Medium is around 200-300.
Low is around 100 somethong.
I tried it yesterday night in a field and it lit it up quite nicely as the huge amount of light does half the work..
Crazybright..
I´m in the midst of doing a build with the same driver but the SST50.