If there was a prize for indulgent design, Blackburn would win by a finned, fancy plastic mile.
The twin 5W LED system comes with a spot and flood head to give a reasonable depth and breadth of illumination with both LEDs running, and a long reach for road or a short spread for slow singletrack. With three levels of dimming you can juggle output and run time, while locking battery connectors stop your leads pulling out.
The giant NiMH battery has an expanding Gore-Tex lining for total waterproofing and the whole set comes with a lifetime defect warranty. It's hugely bulky though and you'll struggle to fit it on a lot of frames, which seems to negate all the natural advantages of compact LEDs.