Maybe you can make your own box ...
currently the setup has about 40 wires, to end this I am actually creating a pcb/shield in Eagle for arduino as several friends saw this ambilight and now want one too for watching movies and playing games.
So I guess I can implement a connector to feed the 12V directly into the shield instead of the arduino, as I then also can implement a power switch without having to cut the power wire.
...inconsequential compared to the amount of work needed to disconnect ...
Well I guess you are right and the arduino has to be permently powered up.
Maybe i can upload the files for the shield once its done if some other people are interested.
thanks for the suggestions mates.