Resistor values for common anode RGB LED?
Hi, I have 10w RGB common anode LEDs. Forward Voltage is R:6-8v, G:9-12v, B:9-11v. Forward current is 300ma. I calculate resistor values as R:15ohms, G:1Ohm, B:3.9Ohms. This is based on max Forward Voltage. I was told I wouldn't need resistors but clearly that is not the case as in one of the LEDs the red has failed. Is it as simple as putting the correct value resitor between each cathode and supply? Also, if I were to increase the resisors to lower the voltage a little (i.e. R:7v=18Ohm, G:11v=3.9Ohm B:10v=6.8Ohm) would that help keep the heat down?