PROJECTOR LENS Vs REFLECTOR LENS

So whats the difference between a projector and reflector lens?

The projector lens has a glass sphere inside which the bulb sits. You cannot see your dipped beam bulb inside the sphere housing.

 

With the reflector lens you can see the bulb within the housing. The beam pattern comes from the shiny reflector element that the bulb sits in front of and is surrounded by.