@petro can you please provide the formula for calculating the needed values for different percent ranges?
My post explains how you derive the equation. There’s no math formula for this, you put in the values, fit a line, and then use the resulting polynomial as your equation.
Works alright for me, and I like that this procedure is clean and easy and least complicated. What I miss is that it ‘only’ results in a fader to dim brightness but you miss the nice stuff you have with a light entity. Also there is no feedback to the brightness when something else changes the brightness value, like a wall button controlling the dimmer.