@Grumpy_Mike thx four your reply. The shield looks like a good investment for my project, but my budget is to small for that.
Why can i only control LEDs with 20mA? I thought the Arduino is giving me 40mA for each port.
Could I drive 8 RGB LEDs with 40mA with there full power on an arduino Mega 2560 (like this one: http://bit.ly/yCGOQR - ebay link)? Would i be possible to control light density and color as well?
I appreciate you help.
greetz,
saland