What is the advantage of a so-called DE lens (also called Xenon lens – technically the term is “Projector – DE Lens”) and a “regular” headlight reflector (technically called a reflector).
The main difference is the way the light is “sent” out of the headlight. A reflector/parabolic “throws” the light in “all” directions controlled by the boundaries of the parabolic – whereas a projector projects the light out, and in this way, the light is much more controlled and directed – resulting in much more concentrated light within the illuminated area – whereas a reflector has a larger and less focused light area.
– More focused light beam (less spread, but better light)
– Less glare – as the light is better controlled in the lens
– No “dark” areas
– Significantly stronger light in the light area
No, like everything else, there is a difference in quality and product. There are many different reflector parabolas just as there are different projector lenses. A small rule of thumb that can be used for projector lenses on aftermarket headlights is H7
Basically, a lens parabolic is more expensive to make than a reflector parabolic. A reflector is old technology, used almost since the birth of the car, whereas projector/lens technology is newer and superior, which is why the technique is also used with Xenon and a similar type of technology is used with LED headlights.