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So we have our own brand, CrystaLux which focuses on LED and HID lighting. It's our in-house brand.
We have a few styles of LED bulbs but our CrystaLux G11 Series are the latest. I believe those probably use an H7 bulb size in the projectors (most common). Our LED kits are available here: http://www.4x4truckleds.com/led-headlights-foglights/headlight-fog-light-bulbs/
Now if you want the most light, HID is the way to go in projectors. You'll get more light over the LED, which is good since it's a projector housing. LED are easier to install and WILL give you more light over Halogen of course. HID will give you even more light but requires a bit more for installation. You'll need to make a hole in the cap on the back of the light and pass the HID wires through, so you can connect them to the included ballast (with our kits). There's also about a 10 second warmup time. But once warmed up, you get a lot more light.
Our HID kits are available here: http://www.4x4truckleds.com/crystalux-t5-series-hid-xenon-conversion-kit/
Our kits include a pair of bulbs.
If you have the stock projectors on your Ford, then you don't want our complete HID Kit. You just want our HID bulbs (as you have HID from the factory already, you can simply swap out the old HID bulbs for new ones).
LED put out less light than HID. LED work in projector and reflector housings. However HID will work best in a projector housing. Factory HID bulbs on a Ford (equipped from the factory that is with HID) are size D3S. Available here: http://www.4x4truckleds.com/crystalux-5-0-series-hid-bulbs-d3-pair/
Unless your truck is new (and if you're driving a Gen1 it's not) your HID bulbs probably need replacing. HID bulbs don't last forever. They start to lose intensity after a few years. So if those are the original HID bulbs it's time you upgrade them. Our HID bulbs are plug and play for the factory system (again just get the D3S bulbs I linked). They'll be slightly brighter then factory were, but nothing CRAZY bright. You'll get a "refresh" basically and a little more light.