Led Lenser MH8 Operation

I don’t know if i’m being an idiot but I cannot work out how this headlamp fully functions. The instruction manual sucks and most youtube videos are not helpful. I have everything sorted less how to manage constant current and energy saving mode.

I watched a video that basically says you cycle between the two modes when going in and out of lock? If that’s the case how do you tell which mode you are in?

Thanks