There is nothing wrong with LED or HID as long as the projector or reflector housing is designed for it. Almost all of your top vehicle manufacturers use led or HID now. GM, Acura, Mercedes, Lexus, Nissan, Toyota, Honda, Infinity... hell I'm sure Kia and Mitsubishi have them now. But they all designed the reflector or projector around using led or HID.
If you just slap led or HID bulbs into halogen reflectors you will have glare that blinds people. Doesn't matter how you aim them, they will glare. Our body style trucks are horrible about it. It is what it is...
I second this.
Pretty much any HID bulbs you can find on ebay and amazon are useless for our trucks unless you have a good quality projector system on your truck.
If you put them in the stock reflectors, you are creating nothing but glare.
If you want to upgrade your headlights to something other than halogen, you want LEDs.
But do yourself a favor, and don't buy cheap ones, most of them outright lie about the lumen output, plus, you don't need 4000 lumen low-beams.
Low beams should be no more than 2000 lumen, and that is really pushing it for reflector headlights.
Another thing you want to make sure of, is that they LEDs are designed to replicate the stock filament position so the light comes out of the correct spot in the reflector (this goes for projector headlights as well)
For my Denali projector copies, I am using a set of HIDs that are from
@Vanquish Auto. Very good quality, and they are designed to work in the projectors. You don't want to use them in reflectors.