Originally Posted by CRAZYHAWK
Being the car wasn't running, you ran the lights with 12 volts. You'll have around 14 volts with car running.
Power = (E x E)/R , that's voltage squared divided by resistance
You'll have 36% more power with the car running.
Ideally yes, but i'm pretty sure daniel stern lighting has discussed that there are massive voltage drops across the stock wiring.
anyway, i did the same thing with my car, huge improvement over stock, glad to see that there isn't a huge increase in housing or wire temperature.