Most of the aftermarket headlights that are all black use projectors. Our stock housings use reflectors. The differences are not subtle..
Look around you; I'm willing to bet that there's at least one LED bulb in your immediate environment. Perhaps the device you're reading this article on has an LED. The reality is, LEDs are everywhere. You've probably upgraded all of the bulbs in your home, garden, and workspace. So what's the...
ledlightinginfo.com
Putting LED or Xenon/HID bulbs into Reflectors is generally frowned upon, as the light pattern is not super controllable and you're not being courteous to other drivers. Using Projectors on the other hand gives a clean light pattern that you can adjust to keep out of the eyes of oncoming traffic.