From Bendyroad

You can set the intensity to 0 (off), 25, 50, 75 or 100 (full on), in a logic block.

For example, a logic rule to set the intensity of led1 to 50%:

 led1 = 50;


Pulse width modulated LED

Property Description
Disabled To disable or enable this block.
Name The name of this block.
Pin The pin to which the LED is connected.
Source A source (another block) that sets the intensity of this LED, from 0 (off) to 100 (full on). 50=50% brightness.
It is also possible to specify a fixed number here.
Comment To optionally enter a comment.
It does not impact the generated firmware.