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Originally Posted by gbae007
Who can tell me why the HID reflector on a Lexus IS300 is optimized for a HID setup whereas my OEM halogen reflector is not?
To clarify: What makes a HID reflector fundamentally different from a halogen reflector?
Isn't the only difference the type of bulb? (D2S versus the D2R.)
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HID reflector has a different focal point than a Halogen reflector.
the light emitted from the HID bulb is in a different location from the light emitting filament on the halogen.
Notice on the H4 bulbs that the low beam is in a different location from the High beam filament. You can switch the beam pattern by simply relocating the light source.
Its pure geometry.