Side-by-side comparisons
Left is HID / Right is Halogen. You can see the HID ballast wiring and the difference in lenses. Halogens appear clearer? Both lenses have ridges in the glass - so both are fresnel?
Now on top
Left is HID / Right is Halogen
Differences in depth of the projector. HID is smaller.
Flipped
Left is Halogen / Right is HID
Left is HID / Right is Halogen. You can see the HID ballast wiring and the difference in lenses. Halogens appear clearer? Both lenses have ridges in the glass - so both are fresnel?
Now on top
Left is HID / Right is Halogen
Differences in depth of the projector. HID is smaller.
Flipped
Left is Halogen / Right is HID