It takes some torque to overcome the resistance of the two O-rings. I suspect these lights will break in nicely with use but as for one handed operation I would state it can be a challenge. With the backlash present in any twisty light, you can "cheat" by twisting the light on and then just backing off until it turns off. At that point you can put a side load on the head (or pull it back) for a momentary on and then off and back on again for a level shift and repeat until you get the level you want. At that point you can twist it on. This can be done one handed but not that easily. I would categorize the Aqua as a two handed light for activation and level changing.
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