It explains on his site the switch debounce time. You have to have it on for more than 1 second I believe, or next time you use the light it will come on in the next mode. If you start in LL and leave it on for more than 1 second, then it should start next time on LL. "[FONT="]The switch debounce time is 150 milliseconds. The mode will advance each time the light is momentarily activated and the switch debounce time has passed.[/FONT][FONT="]This light USES ON time to determine mode switching. If the light is left ON for more than 1 second, the NEXT off/on cycle will return the light to low. If the light is NOT LEFT ON for 1+ seconds the NEXT off/on cycle will advance the mode. The off time has no relation to the mode switching of the light. In most normal use, the light will always come on in low."[/FONT]