HazardsMind:
It is possible if all you need to do is vary the analog signal, however, the arduino outputs 0-5V not 0-10V, SO you will need a amplifying circuit. Actually a simple 0-10V OP amp should work, or if you want to control multiple ones in the future, then a H-bridge will work too.If it is really cold there, then you may want to get a insulated box to put all this in, if you haven't already.
Ok so I need an op amp that I could hook up to the same power supply as the Arduino board, get the 0-5 out of the board and amp it up to 0-10. I think I need to start reading the Arduino "getting started" and docs next...
The "1-10 V" spec seems a bit odd to me, but I guess it starts increasing brightness only after it gets more than 1 V. Or maybe there should be a base potential of 1 V there all the time... I could add potentiometers and use a voltage meter to adjust the output voltage to exactly 1-10 V.
It's going to be inside so the ambient temperature is between 20-25 C all year around.