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Here are a collection of documents culled from the internet regarding the issues surrounding headlight glare, and aftermarket modifications to headlights, including discreet lamp assemblies, non-OEM halogen replacement bulbs, and HID retrofit kits:

139655_web.pdf  
159492_web.pdf
159493_web.pdf
159496_web.pdf
159497_web.pdf
176157_web.pdf (Daniel Stern Q&A)
222580_web.pdf
809-669.pdf
BadBlueBulbs.pdf (Daniel Stern)
causesGlare.pdf
HeadlightGlare.pdf
PAL2001-akashi.pdf

Good NASIOC thread on the subject.

Below are some pics of some Subaru headlight assemblies.  (Thanks to Tobey on NASIOC.)

a.jpg (323305 bytes)b.jpg (434989 bytes)c.jpg (334397 bytes)d.jpg (478744 bytes)

e.jpg (53020 bytes)f.jpg (51647 bytes)g.jpg (56717 bytes)h.jpg (51489 bytes)

Below is a picture of a halogen bulb vs. an HID bulb (thanks nhluhr on NASIOC):