I know this post is a few months old but now that I own both lights I can give a definate answer. My Olight SR90 will throw farther than than my Electrolumens ST90. The SMO reflector of the SR90 creates a smaller hot spot\tighter beam. Both are monsters but if you are looking for throw the Olight SR90 wins. Now runtime is a different story, the ST-90 with 4 18650 cells will last longer then the SR-90 with its 6x18650 battery pack because the Electrolumens ST-90 is direct drive and the Olight SR-90 has a driver. When it comes to future mods the ST-90 wins that battle because it is easy to take apart and you dont need to buy a assembled battery pack. SR-90 mass produced made in china, ST-90 Made by hand with pride in the U.S.A. If $#!t hit the fan I would choose the ST-90 hands down.