After the release of SRT6i for some time, Nitecore released the latest SRT7i, which greatly improved the output and throwing distance compared with the original SRT7GT.
Nitecore SRT7i 3000lumens 580m Long Range Tactical Flashlight. Nitecore have a very impressive throw on the SRT7i, up to 580 metres in the Turbo (3000 lumens) mode.
It also features Nitecore’s 4th generation smart selector ring (for quick access to the various modes and lock-out function) Dual tail buttons with a 2 stage mode button
Here is more detailed information from official