Yes, it helped a lot! Finally, I got to control it somehow (but I dont understand why the test code of the library had wrong commands 
) When I set a single value for the led, it is ok, it is bright and continuous. But when I try and use it in my project, where it needs to read a value from an ultrasonic sensor and map the distance to brightness, and THEN light the led accordingly, it ends up blinking the led, and not even at the correct brightness, it is really faint.
What I understand is that the arduino sends "data" to the board every time the code loops, and that causes the blinking effect ( but I still have know clue why it is really faint.. )
Is there any way I can overcome this and make it nice and continuous, without blinking?
Thanks again for your help and patience... 