The twisty feature is not odd. It is how it is implemented.
People have different needs, thus there are different types of implementations.
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My Preon P1 has 3 main modes, L-M-H with two hidden modes flash and S.O.S.
Before I put the clicky tail cap switch you had to twist the head back and forth to cycle through the modes.
To make it easier to switch modes I put on a clicky tailcap.
Some people think that a clicky tailcap is a cheap gimmick to cycle through light modes.
I think it is a handy feature to cycle through the modes quickly.
It’s much faster than twisting it on and off to get to the mode you want.
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Some people prefer the QTC twisty feature.
This allows the light from being full off then gradually going from dim to full bright as you twist the head tighter.
My Veleno Quantum D2 and my Peak Eiger Ultra uses QTC.
It is silent and you can vary the light intensity with one hand.
This is great while camping or doing surveillance.
Especially when you don’t want to flash the light cycling through modes or make noises with a clicker tailcap switch.
The tailcap for the Peak Eiger Ultra is a momentary spring pressure switch.
As you depress the tailcap it gets brighter, when you release the pressure it gets dimmer.
It is silent.
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Some people don’t want any modes, just off on.
Some people only want two modes, L and H.
Some people only want three modes, L, M, and H.
Some people like multiple modes and memory, L, M, H, memory, S.O.S., flashy
Some people want an infinitely variable light output so they choose QTC.
Some people what an variable light output but no clicky noise or flashing so they choose QTC.
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I don’t think the Olight i3 is going to be any better than my Preon P1.
But I am looking forward to seeing how it compares to my other lights.