brighter head lights?

If you think the Jeep JK headlights are good, you ain't ever seen a good headlight, because they SUCK.

That is true. I sell a lot of Cibie headlamps to a lot of guys who want rid of the junk Chrysler put on the JK ('07-up) Wrangler. They're a nice-looking headlamp, but that's it. The optics are sloppy and so the beam focus and formation are sloppy.

Abodyjoe: Yes, you've identified the right ones. They are same as shown @ Allpar; just photographed from a different angle. Bulb selection depends on which headlamps you're running and the configuration of your charging system and headlamp circuit and other factors. I would be interested to see some results for a voltage drop test of your upgraded headlamp circuit without relays. I think you'll find it better than with the stock thin wires, but still significant enough to merit putting in relays. The headlamp switch might well be able to take 18A, but the primary goal is to see well, not to make sure the headlamp switch lives a long and happy life. The contacts inside the headlamp switch are tiny, and you've still got long lengths of wire with many connections running between the producer (battery/alternator) and the consumer (headlamps).

The test is easy to do; all you need is a voltmeter. All headlamps must be connected - you may have to backprobe the sockets, but removing the socket from the headlamp invalidates the test because then there's no load on the circuit.

Engine off, circuit to be tested (low or high beam) energized

First, connect your voltmeter across the battery + and - terminals. Record the voltage reading, this is the battery voltage (duh).

Connect your voltmeter positive lead to the battery (+) and the voltmeter negative lead to the + terminal of whichever headlamp beam you're testing -- use the bulb farthest away from the battery. With the lamps on, your voltmeter will give a direct reading of the voltage drop. Write it down.

Then connect the positive voltmeter lead to the ground terminal of the headlamp bulb, and the negative voltmeter lead to the (-) terminal of the battery. With the lamps on, your voltmeter will again give a direct reading of the voltage drop. Write it down.

Add the two voltage drop figures obtained, and this is the total circuit drop.

Subtract the total circuit drop from the battery voltage to find the voltage at which your bulbs are operating.

Remember, light output drops exponentially (to the power 3.4), not linearly, with voltage drop. Small voltage drops = large light losses.