is this a problem?
i want to operate several RGB led and applay to each the same volatge (just in order to get more of the same light)the ones i have are common anode so i need to connect the anode to 5 volt and each of the rgb legs to the PMW output of the arduino (via limiting resistors).
But aren't these for making a bar display? That is a display where the number of bars or LEDs lit is proportional to the applied input voltage.
I don't see how that answers the OP's question.