I do not recommend changing emitters on magnetic rotary lights, because it can make the magnetic ring overreactive. The light will continue to change brightness after letting go of the dial. If I dial up and let go of the dial, the light continues to get brighter. If I dial down and let go, the light continues to drift down. I can see the change with my naked eyes.
They also change brightness simply by pointing the clip north or south, with the stock LED, depending on the orientation of the light in the earth’s magnetic field, but the change is only 10%, and I can not detect that with my naked eyes, only on my light meter.
Selfbuilt noticed this drift too, but mentioned it was not visible to his naked eye. Everyone Ive asked who owns a V11R is unaware of any visible drift in brightness. One of them, ven has a 219b mod, but I do not think he has a light meter, and he says he does not notice the drift. I believe him, it is not easy to notice brightness changes without a meter.
The V11R that I tested modded to 3000k 219c, had drift of 100% change in brightness and I could see it with my eyes. I found that unacceptable.
just to prove that a non magnetic light does not drift in the same situation:
and here is the stock drift on an RRT-01, notice the position of the clip changes
thats about a 10% change, I can not see it with my eyes, and disclaimer, that is a homebrew meter… those lumen values are approximately correct imo, Ive tested a lot of lights with that setup… ymmv