ldr resistance

tengu doubt which is the resistance (ohms) of the ldr used in this circuit?

Quizás quisiste decir: Tendrán un circuito similar a este?
Would have something like this circuit?

I can't make sense of the link you have in the time available.

I suggest you experiment with whatever LDR you have available. I suspect you could modify the Arduino code to get any LDR to work with your project.

...R

This is exactly the sort of circuit I played about in the 1960s.
The LDR should have a dark resistance of about 100K.
You will find it is a very non linear control with little brightness and then it comes in a rush. This is due to haveing two log relationships in seriese.
Good luck.