We held a CE light and a Scout side by side today and there weren't many differences. Bodies are pretty much the same with a slight difference in the attachment point on the bottom (CE rounded, Halcyon square) and the grip (CE rougher, more knurled than the Scout). The lightheads are exactly the same as far as we could tell and the only other difference we were able to discern was that the CE lights use double o-rings on the lighthead attachment point and the Halcyon light uses one.