Globe 409A582 / gecko

--------------------------------------------------------------------------------

Hello all.
I have a set of globe rotary table units and am in the process of getting the flanges removed and a "T" bracket made up to make a 4th and fifth axis.
This motor are rated at 12VDC, and a 340 gecko as a voltage range of 18vdc to 80vdc. I found this link http://www.futurebots.com/parts.htm that says the motors seems to work from a voltage range of 6vdc to 24vdc.
My question is what voltage do I use to design a powers supply. Do I run the motor at 18vdc and accept the short life of the motor. Or do I underpower the gecko drive.
Any help would be appreciated.