Here are the 4 mode groups they use on the C8F. Remember to ignore the actual lumens, just see the level spacing.
• Group 1: Low 2 (85 lm) > Medium (650 lm) > High 2 (1330 lm)
• Group 2: Low 1 (37 lm) > Low 2 (150 lm) > Medium (790 lm) > High 2 (1330 lm)
• Group 3: Low 1 (22 lm) > Low 2 (80 lm) > Medium (630 lm) > High 1 (990 lm) > High 2 (1540 lm)
• Group 4 (muggle/kids group): Low 1 (20 lm) >Low 2 (70 lm) > Medium (150 lm)
The original group is group 1 and it always cycles from low to high.
1) Fast click for ON and hold 0.5 seconds to turn OFF (This can probably be changed to: fast click for on and off)
2) Memory function: From OFF, hold 0.5 seconds to go to the previous used mode (sounds odd to me)
3) In any mode, including OFF, hold 1 second to go to moonlight (1 lm)
4) In any mode (except lock-out and kids group), double-click to go to turbo (2580 lm), one click to go to the previous mode.
5) To lock-out the light, from OFF, click 4 times rapidly, the light blinks twice to lock-out; click 4 times rapidly, the light blinks twice to unlock.
6) Battery level indicator: Click 3 times rapidly to go to battery level indicator. At 50% - 100, 4 blinks to confirm; At 30 - 50, 3 blinks to confirm; At 15 - 30, 2 blinks to confirm; At 0 - 15%, 1 blink to confirm. The light finishes blinking, goes to the normal lighting.
7) Low battery indicator: 3 blinks when the battery level is lower than 30% will then go to previous lighting; blinks lasting for 1 minute when voltage lower than 2.8 volts will then go to turn off.