Yikes. I guess none of you are too familiar with HID's. I would recommend visiting www.hidplanet.com
Despite being a long time lurker I feel that I should comment. For starters, the Lexus IS300 uses a D2R based bulb in their reflector headlight. This is also used in the Prius and all non projector type housings. The bulb actually has a black film around it to correctly direct the light without blinding other motorists. Do a google search to see the bulb. The actual reflector is shaped differently than a hallogen reflector would be also to correctly direct light into the road.
D2S bases have a clear bulb but are used in projectors which have cutoffs.
http://forums.justcommodores.com.au/attachments/vz-holden-commodore-2004-2006/42424d1195174066-hid-xenon-conversion-pix103ej.jpg
A forum member from HID planet retro'd a set of projectors from another vehicle. The quote below is referenced in the learning section on HID planet's forum. Most members there use their forums to learn more about how to correctly retro fit projectors from other vehicles into their own. I would not recommend any of you to use HID kits, including the bi-xenon ones with those reflective shields in front of the H4 bulb. The posts from Battman clearly show how much glare other drivers will see when you are driving. The correct way would be to do what rb26 did and retrofit a set of bixenon projectors into a 7" headlight. This way you would have the function of highs and lows and have a proper cutoff.
Hopefully that will get the ball rolling for proper retrofit projects and not the typical easy way out blinding hid kits. I will probably do this once I have more time to research the different housing options and find one with a clear lens without any fluting. I still need to finish my LS430 retro on another vehicle as well.