There are 4 different setups for lighting
Reflective HID- Which is made for D2R bulb and reflects the light up. even the reflector is different than a stock halogen setup ( Toyota Sienna ) NOTICE the bulb reflector, It is putting everything up!
Reflective Halogen-- This is your standard lighting. This puts light everywhere in the housing and is made for halogen bulbs. NOTICE the bulb reflector, It is allowing light on the sides...
HID projector-- Made for a D2S bulb, any other bulb will not fit unless it is modified.
Halogen projector-- This is made for Halogen only, If you install HID, the focal point will not be the same and you pattern will be very weak. Tried it with TYC projectors already
Its anyone's judgement on what they want to use. I wanted HID 4 years ago in my 02' Accord. I planned to go the cheap way and it failed. So I went the projector way. I got all OEM stuff and had no problems. That is the price you pay for going PnP, is the ballast and bulbs
If you buy a kit for $200.00, I can guarantee you it will not last that long. Something will fail within 2 yrs or sooner
Read up on this link. It is very informative and better than going to Hidplanet
http://faqlight.carpassion.info/
It has everything you need to know about lighting