Halogen projector housings are not designed for HIDs, both for temperature control and light projection control. HIDs and LEDs throw an extremely sharp beam of light. The projector housing does nothing to shape that light, so HIDs and LEDs can end up being dazzling to oncoming drivers. Light housings designed for HIDs and LEDs shape the light beam, in particular by creating a sharp cutoff of the upper edge that keeps the light beam below the eye level of the oncoming driver. It makes a significant difference in the dazzling effect. I had a Passat with halogen projectors, and it would have been terrible to put HIDs in them.
Another thing that most (but not all) cars with HIDs or LEDs are leveling lights. If the rear of the car is loaded down, the lights adjust to keep that sharp upper edge where it belongs. Cars with standard projectors do not have that function.
2019 Kia Niro PHEV EX Premium
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Last edited by atc98092; 09-24-2019 at 09:43 AM.