Found this when as suggested doing some googling on Interface-Z - on this page some test pd patches and more...
http://www.interface-z.com/produits/act054_8_trans-puiss.htm 
and a vid:
http://www.youtube.com/watch?v=JAjILa4MOu8 

/Björn Eriksson


On Mon, Mar 26, 2012 at 9:35 PM, Jean-Marie Adrien <jma@jeanmarie-adrien.net> wrote:
hi
if you're in a hurry, google interface-z
jmadrien

Le 26 mars 2012 ā 20:02, Jim Hickcox a écrit :

> Hey there.
>
> I am working on an architectural installation with a guy and part of
> the goal is to control some dim lighting from Pd.
> Does anyone have any experience with the steps for taking the midi
> output and making that control some LEDs?
> Any recommended workflows?
> I was thinking about trying to build something with an arduino, but
> maybe there's something more time-efficient, since I only sort of know
> what I am doing.
>
> Any suggestions would be appreciated.
>
> -Jim
>
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