It may be cost effective, but it would be counter-productive. the OPTICS are different and thats why the projectors are required to be different. even in the new camry's, I can guarantee that the HID projectors are not the same as the non-HID projectors.aigochamaloh said:that may be the case for your older lexus, but even with the halogen bulbs, there is an obvious sharp cutoff just as you would see with hids in the new model camrys. makes sense too, since it's cost effective to just make the same housing.