The ballast has a web address on it: www.brightstar-hid.com.

Specs for the ballast are:

Voltage input DC 9V~16V
Normal Voltage Input 12.8 VDC
Normal Current Input 0.9A
Power Output 10 ± 5%
Maximum Current Input 16.2A
Operation Power DC 65 ± 12V
Operation Temperature -20°C~80°C
Storage Temperature -40°C~105°C
Efficiency over 85%

And as far as I can tell the bulb is a 12W MR-11 10° (35mm diameter).

Specs for the bulb are:
Operation Voltage DC 65V ± 12V
Wattage 10.5W ± 0.5W
Current Input 0.9A
Output (Luminance) 550lm
Color Temperature 6000K
Life Span(hrs) over 1000 hrs
With UV-cut shield YES

I've just carried out a runtime test using a 8 cell 3700 mAh sub-c nimh pack.

The HID sustained full brightness for exactly 2.5 hours and voltage at the battery started at 10.65V (under load) and the ballast shut off when the voltage dropped to between 8V and 8.5V (under load).

Light output seemed to be adequate and more floody than I expected.