Though incorrectly marked as common cathode, these common anode high power tri-color LEDs are standard fare across most discount parts websites, eBay included. They are sold with a 3W designation, each color drawing 350mA for a three watt total. Mounted on a star, they should be heatsinked with proper thermal paste if running for any extended period at normal operating levels.

Characterization at 350mA yields the following results:

Running them in voltage mode with PWM will require careful attention to the maximum duty cycle value. Using PWM we calculate the maximum duty cycle with the equation (LED Voltage x Bits / Supply Voltage). The chart below indicates the maximum PWM value at some common bit resolutions when running from a 5 volt supply:

Staying under these maximum values on Arduino is greatly assisted by the Modulo operation and/or the map command:

// sets the redledpin as output
pinMode(redledPin, OUTPUT);

// Scale PWMoutput to achieve full range 0-183
// Using map(value, fromLow, fromHigh, toLow, toHigh)
PWMoutput = map (PWMoutput, 0, 255, 0, 183);

// Use Modulo to limit output
PWMoutput= PWMoutput % 183;

// Set output using analogWrite
analogWrite(redledPin, PWMoutput);

And finally a macro shot of all three chips, check out those awesome miniature crop circles: