So the designer of this light has a different logic of how flashlight should be controlled.
1. To access FireFly mode, the designer wants your iris to shrink up first so the FF mode will look REALLY low.
2. There is no way to access "high" mode aside from waiting for 3 min from Turbo?
3. Then, once you are after 3min and it dims to High mode, if you want to go back to Turbo, you have to turn off the light, let your iris open up and go back to Turbo (so now the Turbo looks really bright?).
4. It uses magnetic ring control but is not infinitely variable. I hope it has detents so you can feel your switch position rather than guessing by judging the brightness to determine your mode.
5. Is it a heat dissipation issue to keep the light at 300 lms because of so little metal?
6. I wonder how many fingers can be grabbing the light while still able to manipulate the control ring without fussing, with one hand. Light is 7.6cm and judging by the picture, control ring is about 1/3 way down. That leaves about 5cm (slightly less than 2 inches) between ring and end of light.
7. I can see the tail of the light to be a dirt collecting place, with or without the spike.