The problem with adjusting light intensity is that the light perception curve is not linear.
It is still simpler to refer to the LED technical sheet to have at least an idea of its brightness, but you still need to have the LED reference.
Between the two LED references, the intensity of the stronger one (OSXXXX3131A-1MA) must be reduced to 10% to have the same light perception as the weaker one at 100% (OSXXXX3164A-1MA).
This is why I only buy LEDs for which I have the reference.
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