I have a 4000 lumen mag mod, 6 XM-L on 4 26650 IMRs, very floody and illuminates better than my car headlights on bright. VestureOfBlood built it with a customizable driver, multiple levels. If I turn it off at a mid level, when turning on I can have near instant access to low, mid, or high simply depending on how long I hold down the switch.