I have a led security light with a pir sensor, and the knobs? which are
used to adjust time , sensor and lux are a bit confusing as to which end
is the setting end.

The 3 knobs are all the same shape, and when you look at them or just
one from the side view, it is tapered and has a small dimple in the high
end. All 3 knobs turn through 360 degrees, as it is a bit like guesswork
at the moment, but I'd prefer to take the guess work out of it when
setting the light up correctly.

Any ideas anyone?