The McKinley uses a driver set to the "UP" power level, and has seven 5mm LEDs. The Logan uses a driver set to the "#6" power level, and has a single Cree XP-G LED. Both have heads made of stainless steel and battery tubes made of anodized aluminum. I selected those because they protect the expensive contents of the head while trimming weight on the easily-replaceable battery tubes -- and because I can get knurling in aluminum.