It says it on the battery. I have a lot more lights then your talking about. I can run all 10 100W forward lights and 4 55w's at idle with the stock setup. Still maintain 13.5V. You can also swap out your alt pulley for a smaller one. That will increase the RPM of the alt. at idle... fooling it like your stepping on the gas. As long as your above 13V your battery isn't powering the lights... the alt. is. The only time I've run into trouble with the stock battery draining is when winching heavy load for long periods of time.

 

Cool, thanks Badass Jeep you've got there.