Unfortunately, i don't believe there is an easy way to find out what power it uses (I may be wrong on this, tho). A multimeter typically tells you how much power is coming FROM the connection, not how much it can handle.
I see that it has 3 prongs, so most likely it takes 2 different voltages. The Standard LEDs in the xbox also have 3 prongs. I believe 2 are power and one is ground. Then depending on which connection receives the power will determine the color of the LED. unfortunately, I have no idea which prong is which. hopefully someone else can help you answer that.
EDIT: You may want to check in the case modding forum, as people there might be able to help you more.
This post has been edited by The Juggler: Sep 28 2004, 12:32 AM