Don't do LED headlights unless you're planning on doing the TruckLites or equivalent in the W/T grille. We've discussed this to death in other threads here. The factory composite housings on these trucks were designed for halogens, anything else doesn't project properly and will blind the hell out of oncoming traffic. Same reason aftermarket HID kits looks so offensive in traffic.
Brightness isn't the issue, it's how the reflectors and bulbs are designed to work together. If you just have to have something that isn't factory, look into replacing your high beam bulbs with HIRs instead of the factory halogens. Bulb number 9011 is what you want to replace the factory 9005s. You will have to do some trimming to get them to fit in the factory retainers. Here's a link describing the trimming process.
https://sep.yimg.com/ca/I/yhst-91565365470012_2267_311973
Some people have replaced their 9006 low beams with 9012 HIRs, but I can't personally recommend that swap. Look at a 9006 bulb and a 9012 side by side. See the glare cap that's painted onto the 9006? Notice how it's not there on the 9012? That will almost certainly cause a hot spot of glare to oncoming traffic.
Personally I run factory halogen bulbs in both of my trucks, with Anzo 111006 headlight housings, 4-Hi harnesses, and relays to power the whole thing so the system isn't drawing all that current through the headlight switch. It's plenty bright if all your stuff is in order.
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Don't be the guy blinding oncoming traffic, please. If you really want some great info on vehicle lighting in general check this thread out sometime. Plenty of incoherent rambling, with a ton of great info in between.
http://www.gmt400.com/threads/spyder-headlamps-my-take-on-em-and-lighting-in-general.36647/