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xwLedControl is using PWM to control the voltage on to the connected LED's, depending on the connected battery and how you program the led objects in your timelines. But the standard xwLedControl is not limiting the current going into your lights, therefore all LED's connected need to have an inline current limiting resistor soldered to them, which is calculated according the maximum current allowed for the LED, and the battery you connect to your device. NEVER connect an LED directly to xwLedControl without inline resistor, you will kill the LED's sooner or later. Some LED's already have the resistors built in, like 12V LED's, LED strips or RGB strips, these you can connect to the controller directly without problem.
xwLeControl can deliver several amps of current to the LED's, so it can control very high brightness LED's. But the inline resistors will get hot, the higher the resistance and voltage of attached battery. Check the resistor calculation wiki page for more information.
Every LED you connect to the controller will be connected to the same positive terminal, so every LED will have the battery plus pole connected to the positive side of the LED. The brightness controlled by modulating the negative pole (cathode) of the LED by PWM. In case you want to control RGB LED's or RGB strips, make sure your purchase Common Anode LED's / strip, that have a shared positive terminal for red, green and blue, and an individual negative terminal for all colors.