The EL wire needs an AC voltage of 120V. The frequency of the AC voltage affects the brightness. http://www.glowire.com/drivers.htm (you could have found this hours ago had you googled "EL wire voltage")
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I don't think its as much voltage you need to worry about - that's independent of cable length and is probably more to do with colour than anything, but it WILL depend on current. Steve
Gee, I woke up too late this morning to say the same thing first.