Aurora AK-P7-3 SSC P7-C 900-Lumen 2-Mode LED Flashlight on the bars
On high: Runtime = 2 hrs 16 mins (continuous)
On low: Runtime = 5 hrs 43 mins (continuous)
Carry some spare batteries in case you need them.
Not a thrower but plenty of light, use any Q5 torch on your helmet.
Some Q5 torches use a 18650 battery which should give a long run time.