Be real careful and please see
this post. Although they are widely available, "HID kits" in halogen-bulb headlamps (any kit, any headlamp, any vehicle) do not work safely or effectively, which is why they are illegal. See
detailed explanation here. Almost all the HID setups sold in the sealed-beam formats are exactly that: an "HID kit" and a halogen (usually H4) headlamp lens/reflector.
Good, effective, safe headlight performance is
not just a matter of how much light you can spray out in front of the car. The right amount of light has got to go where it's needed, and light has got to be tightly controlled in areas where too much of it will spoil your safety (or blind other drivers, which eventually amounts to the same thing).
There are two (and only two) HID headlamps in the 7" round format that are effective, good, safe, and legal. They are the XE7 and the XE7R from
ValeoSylvania. The XE7 is the better performer, but it's also fugly-lookin'. Both will require the central hole in the headlight bucket to be enlarged.
There is one (and only one) LED headlamp in the 7" round format that is effective, good, safe, and legal. It is the Speaker #8700. Finned aluminum housing, glass lens, advanced optics.
For either of those two options, good HID or good LED, you're looking at around $450 to $500 apiece (times two per car). Is it worth it? That's for the guy with his name on the credit card to decide. You do not have to spend big bucks to have objectively good headlighting.
Bad headlighting sucks, whether it's crummy sealed beams, cheap-and-nasty H4s, also-ran LED units or halfaѕѕed HIDsÂ…and the "catch" is that the human visual system is a lousy judge of its own performance; it's very easy to create situations where we think/feel we can see way better or worse than we actually can. That's why a lot of guys with bad lights go around talking about how great their lights are. They aren't telling lies, it's just that they aren't seeing what they think they're seeing, because they're human beings.
If what you really meant to ask was "How do I get really good headlights on my A-body?", then see
here. Put in Cibie H4s if you want excellent headlamps (but they're costly), or put in GE Night Hawk H6024NH sealed beams from
www.amazon.com (search
H6024NH) if you want decent and cheap but not very long lived. Don't get Sylvania, Wagner, or other junk. Whatever lights you put in, make sure they're fed by
relays, and you can also upgrade the car's other exterior lights (see
here).
The Jeep JK Wrangler ('07+) items are pretty to look at, but optically they're poorly focused.
For more detailed headlamp info, see
here and
here and
here.