https://www.iihs.org/iihs/ratings/vehicle/v/alfa-romeo/giulia-4-door-sedan
The lesser trims of the Giulia exhibit identical low beam performance on the straightaways. However, the lesser trims of the Giulia also exhibit significantly more glare than the higher trims of the Giulia (67%).
How is it that the HID projectors in the lesser and higher trims have identical low beam performance but the lesser trims exhibit much more glare?
I thought that in projectors, the cutoff is created by a piece of metal. How could this piece of metal have been changed to give identical low beam performance while letting more upward, stray light through?
I want to say the results are the product of aiming discrepancies, i.e. maybe the lower trims use less powerful HID lamps and require more upward aim adjustment to actually hit the low-beam performance targets set by the IIHS, but the high-beam results don't support that theory.
What's the deal here?
The lesser trims of the Giulia exhibit identical low beam performance on the straightaways. However, the lesser trims of the Giulia also exhibit significantly more glare than the higher trims of the Giulia (67%).
How is it that the HID projectors in the lesser and higher trims have identical low beam performance but the lesser trims exhibit much more glare?
I thought that in projectors, the cutoff is created by a piece of metal. How could this piece of metal have been changed to give identical low beam performance while letting more upward, stray light through?
I want to say the results are the product of aiming discrepancies, i.e. maybe the lower trims use less powerful HID lamps and require more upward aim adjustment to actually hit the low-beam performance targets set by the IIHS, but the high-beam results don't support that theory.
What's the deal here?