Tom E As the author of the firmware, the primary default mode is smooth ramping with 150 unique steps that ramp in about 2.4 seconds. In addition though, there are 12 groups of pre-defined mode sets, if that's what you prefer, but most people prefer the ramping once they've used it. There are strobe modes though - if you are at max/turbo, a double-click will display an intense strobe. So from OFF, you can dbl-click, then dbl-click again to get to strobe.

Tom E Mine is now doing 25.2K @start, 21K at 30 seconds. I added bypass wires on all 5 springs though, removed those blocking tabs around the batt+ contacts, few other minor tweaks but left the stock driver and FET. I used the VapCell 2800's which are VTC5D rewraps - bout the best cell for this light. Stock the light hit 20K lumens at start. Something is wrong there - what cells are you using? You must use high quality, high power cells.