really appreciate the help guys.
I am working on purchasing everything I need but want to make sure I buy the right power supply resistors ect.
I thought the brightness would be based off of the Amps not off the watts.....
I really did not think I needed to worry about watts..
I am running the arduino to a shift register using http://www.elcojacobs.com/using-shiftpwm-to-control-rgb-leds-with-arduino/
then out of the shift register to a TIP120 or TIP122 transistor then to the rgb LEDS.
The LEDS will be always on but different colors. It will work like a meter. left side a blue green right side a Red green.
base on something like pressure ect. from another input the "meter" will sift showing more blue green and less red green or less blue green and more red green.
Right now I am just doing the 20 rgb leds but would like to get a supply that will be able to handle the 80 rgb leds
Sorry for my ignorance on the subject.