You'll need all of the above, unless you want to run an independent high capacity battery that you have to remove and charge after every ride.
From what I've read, Ricky Stator has a charging system made for a banshee that'll work on the zilla.
I believe it's this one, maybe someone can chime in and clarify? (Rogue1970 comes to mind, check his thread at the bottom of my post)
http://www.rickystator.com/catalog/single-phase-rectifierregulator-p-88.htmlAnyway, once you get a rectifier/regulator set up, you'll need a battery to charge since the idle current/voltage of the stator isn't adequate for a driving light.
The battery provides adequate current and voltage to run either an LED setup for an HID at idle, or while the engine isn't running for that matter.
At that point, all you need to do is hook up the LED's and go blind banshee riders.
One alternative (something I'm still confused about) is to buy an LED lightbar that's already set up to run on 12VAC direct from the stator.
I've only seen one advertised (it was from bajadesigns.com, but that was months ago and I can't find it now), but their drawbacks are that you're limited to running the LED array that they have available (you don't have the lightbar options ChrisG has available) and it's probably more expensive as a result of additional components needed to rectify AC current.
However, it's probably a plug and play setup, just hook the power wires to the wires that went to the original light, mount it, and run.
I just got through doing considerable research into the subject trying to find bajadesigns' AC lightbar setup, and I've come up with a different retailer as a result:
http://www.lazerstar.net/index.php?main_page=faqs#i4It's their product FAQ's, and I found something interesting.
Look down until you find this posted:
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Q. If my quad doesn�t have a battery can I run LED�s?
A. Yes! Any of our LED�s will work on AC bikes, including the LX LED bars.
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So what I get out of it is that if you buy their LX series of LED lightbars, you can run it on AC current.
However, when I looked at the 10W discovery lightbar, it said 9-32V DC input in the description.
This can mean one of two things....
1. They're full of BS about all of their lights being able to run on AC current.
2. Other LED lightbars that specify 9-32V DC input may work fine with AC current.
If the first is the case, they'd probably have quite a few returns and warranty claims after guys like us smoked the LED's when we tried them on AC current.
If the second is the case, perhaps ChrisG's lightbars can actually run on AC current...I doubt anyone is brave enough to risk that kind of dough on a theory.
I don't see anything in the LX series description that it's capable of AC current, nor does it say anything about them containing additional drivers and rectifiers to handle it.
Initially, when I first started hearing about LED's on quads, I thought running an LED with AC current would fry it, then I heard that LED tail lights worked fine and got me to thinking that some diodes are designed to run on AC current (the diode trio in an alternator for example), and if those diodes hold up fine then a big LED like a CREE XM-L shouldn't have any problems with it.
Well, come to find out, they're fired up with a driver that regulates the amount of voltage and current that goes into them, at least in battery powered flashlights, so the drivers might not be able to handle varying voltage and AC current but the LED itself might.
Now I'm hearing that the LED lightbars from lazerstar can handle AC current....so I'm honestly clueless at this point.
Maybe someone should call these guys up at lazerstar and find out the whole story about AC current and LED lightbars.
If the answer is that most any LED lightbars can run AC current without a battery, then I suspect ChrisG is going to have a hard time keeping lightbars in stock

Here's another thread about the subject, with a lot more information:
http://www.suzukiquadracerhq.com/custom-chassis-suspension/quadzilla-ledhid-lighting-with-12-vdc/msg6409/#msg6409