Nice review/advertorial. But there is no 26800 tube as he suggests for the WB3 - at least not one that fits the tailcap properly. Apparently there are 26800 tubes for other Astrolux models but not the WB3.
The tube with spacer and 21700 battery threw me at first, but on re-viewing the video I get that the tube is designed for a 26650 battery. So why not provide one of those with the WB3 in the first place?