Maybe your source is confusing LED with halogen or HID (I'm being kind here)?
Light emitting diode (LED) headlights are coming on more vehicles each year. Consumer Reports takes a look at this technology and explains that these lights may not be better than halogen lights.
www.consumerreports.org
I put LED headlights on my BJ8. They were the whole bulb, inc. reflector, heat sink and lens. They are a bit brighter, the pattern is more squarish, and the color is a more bluish white than incandescents. The only thing I don't like is that the lens is flatter and doesn't go with the Healey's lines (but I can live with them). Where LEDs really, uh, 'shine' is for running/brake lights; I got tired of other drivers telling me my brake lights weren't working (at least partly because I don't accelerate into stoplights).
LEDs in the first image. Fourth pic is LED on the left, incandescent on the right; both are red (I think the LED 'overloaded' the camera).