Lights

1700lm from 6 x XP-G R5 suggests they're being run at >800mA (how much more depends on how many of the lamp lumens they manage to get out of the front of the housing to their "laboratory"), so 3.25V and 15.6W total lamp power, 4.5h at that is 70Wh. Battery capacity 14.8V x 5.2Ah = 77Wh. So, well done them for achieving a combined efficiency (driver circuit x optical design) of >91%, especially from such a tiny system. Of course, you can have 100% optical efficiency by just surface mounting the LED chips on the front of the housing, but that does mean that not much of your light gets thrown where you want it, as the beam shots show - the dispersion is basically the more or less uniform hemisphere of a bare chip

How does this ^^ compare with the Exposure, Magicshine and Four4th stuff?
Are you saying that although efficient the beam pattern is crapola?

These look a bit easier to mount on the TT bike to me given their offset mount design but I'd like to see their battery pack too.