The best replacement for projector headlights is hid.

The best alternatives to projector headlights are rated as following:
★★★★★  hid
★★★★★  halogen
★★★★  regular headlights
★★★  hid headlights
★★  reflector headlights
★★  reflector
★  non projector headlights
  normal headlights
  factory headlights

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Speaking about projector headlights, one probably shouldn't forget about hid.

Other search terms related to projector headlights and their ratings are:
★★★★★ hid
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Google Trends

Scale is based on the average worldwide traffic of projector headlights in all years. Click on graph for more.
projector headlights
hid
halogen