This shield drives and controls power LEDs (LEDs rated 1W and up). In addition to PWM dimming control, the output current of each channel is adjustable with a trim-potentiometer for driving LEDs at less than
1000mA.

The PWM pin for each channel is jumper-selectable and any combination of pins can be assigned. For safety and proper operation, the drivers are electrically isolated from the Arduino pins by opto-couplers on each channel. The shield also includes a 5V regulator that can power the Arduino.
4 individually addressable channels.
Each channel adjustable ~50mA to 1000 mA.
1 to 6 LEDs per channel (more if you run strings in parallel)
Any combination of LED colors.
Full opto-isolation to protect the Arduino.
5V regulator to power the Arduino from the shield.
Drives 85 Watts of LEDs from one shield (6 LEDs x 3.6V x 1000 mA x 4 channels)
Stackable (estimated up to 8 shields can be stacked)
Minimum input voltage: 6 VDC.
Maximum input voltage: 32 VDC.

Arduino Chesters Garage Power LED Shield Pinouts