Purchased an RGB led strip some time ago, 1m, waterproof, for 3€ from ebay. (Unfortunately, it was not tri-led, so keep that inmind when you purchase)
Did a quick test with a multimeter, it pulls around 170ma per channel.
The RGB LED Lighting Shield with XMC1202 is very straight forward. Just need to solder 4 pins (SCL, SDA, GND, IC2 pull up) so you can stack it ontop of arduino uno.
I then found an arduino demo on infineons website here:
You download a windows installable, which upon execution places a zip in install directory, and then you need to extract the zip, so you can get a single arduino ino file !
Why all this trouble, for a source file!? I think this is a good oportunity to introduce https://codebender.cc/
It's an online arduino IDE, which you can even compile a sketch and upload directly to your arduino from the browser.
And here is the infineon rgb demo source:
(I've tried to embed it, but element14 site does not like it I guess)
and this is the result: