i found a way that shows the difference from high to turbo.
First, turn the light on, cycle it to high mode, then turn the light off.
Now the timing is tricky and it may take a few tries, double click the switch from off but not too fast. You will see it come on high and then turbo. It will then be quite noticeable.
Let me know if it works for you! Remember timing is key and don’t go too fast and don’t go to slow.