That's a good point I hadn't thought of. I like the focus on the one you linked too, bike lights don't have that. I wonder how wide it can spray. The 2-head Ravemen that I linked above has a high beam and a low beam.

The BT40S I was looking at is a stand alone light head and would also need charger, battery box and cable. All standard stuff but not included... however that light appears to have been re-stocked in yellow not white light.