The reason they give makes no sense . let's look at some other lights with the same size heads. Eagletac M30lc2 2.5 head with a xm-l2 u2 66,000 and 514 meters , with the xp-l hi 91,000 and 604 meters . This is the best light to use because it has the same head different LEDs . Then we have olight m2x-ut 2.48 head and only 20 more lumens has 164,000 and 810 meters throw. We could also add Thrunite tn32 to the list with both LEDs in the same head. I think Fenix should do some more math on this xp-l hi more money, happy customers , and they don't look like sure fire years behind all the others with led Technology . At least surefire is top dog on build and USA made , so they have no reason to keep up-to-date because people still buy them because they are US-made and you can get customer service quick . Fenix will lose customers quick when they don't keep up-to-date ,because that's the only thing they have going for them . customers are Quick to leave when they don't keep up-to-date because you have 4+ other like flashlight company's that keep up and are around the same price. The math on the 2.5 inch light vs what Fenix said is way off. Please show this info to Fenix all the posts. And one last thing everyone else has lower or moon light mods.