some info that i found that a guy on jeepforum posted in the WJ area
[QUOTE=lvum4x4;10733021]I would recommed that you consider quality over quantity when it comes to lighting. My setup is a little unique for this forum but LED technology has come a long way and ultimately offers many returns on the overall investment. Try to think of you lighting needs in terms of how much light output you want to project (total lumens), then you can calcluate your power needs appropriately for any given solution (halogen, HID, LED, etc...). It is not always better to just have a bunch of KC style lights on your vehicle; think of the efficiency rating for the lights you choose.
Lets take a simple KC (halogen) style lightbar with 4 lights:
The average amperage (or total power draw) that each light will draw will be about 8.3 amps per bulb (100w) for a total of 33.2 amps so you will need to use a 40amp relay to safely run that configuration. My WJ OEM alternator has a rating of 136amps for the whole vehicle so 4 KC style lights would equate to close to 25% of the total power availble for the vehicle. It is hard to determine the total lumen output for a 100w halogen but my best guess would place the light output somewhere around 150-200 lumens or 600-800 lumens total for 4 lights (my math could be off but the pattern should be evident) and that would have a power consumption of about 33 amps.
Now look at a modern style LED configuration like mine ...my 40" LED lightbar puts out 14,525 lumes at a total power cost of 12.67 amps. Can you now see what I am referring to in terms of efficiency? HID's will be somewhere between the two but it should be obvious that with today's technology, more is not always better so try to do your homework - you should start to see that you can leverage technology to your advantage.
How many amps do you think this guys is running?
Here is my setup:
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