Originally Posted by
cyccommute
Overvolting reduces the amperage draw. Amps = watts/volt. A 10 W bulb at 12V draws 0.8 A while the same bulb at 14.4 V draws 0.7A and puts out twice as much light.
Amps = watts/volts = volts / resistanse. Resistance does not change with voltage. 12V 0.8A will draw 0.96A at 14.4V, or 13.8W.