Some guys just want to prove they can build power supplies, the LED lights are just a selectable load for him. This is a total waste of time and energy other than proving he could "build it". One HID light would make that look sick and be a lot easier to handle. Two MC-E or P7 type flashlights will be far better performers than that. It is an absolute joke to carry that thing around as a hand held flashlight. My Malkoff Wildcat is far more useable brightness than that in a much better package. But seriously something like the Nail Bender triple P7 that would run 18 to 24 watts of power will put out more useful light than that thing.
So yeah its a good laugh. He gets a D minus though for "packaging" as he lost sight of the goal of to not make it a monstrosity.