Originally Posted by Timthom62
EDIT: It should be noted that on vehicles equipped with the Dual Automatic Temperature Control (DATC) system, the light sensor also serves as a 'sunload' sensor for the airconditioning system and supplies information to the HVAC module proportional to the intensity of the sun on the vehicle.
If you're 'spoofing' the light sensor, it may also result in the cabin temp being a bit warmer (or at least slower to cool to set temp) on sunny days.
This appears to happen on the Manual Temperature Control system too... When the sensor is shaded, A/C output is reduced... Probably to increase fuel mileage..
As far as certain colors of cars becoming harder to see as it gets dark, I notice my silver car at dusk or dawn becomes almost invisible once you get about 30 yards or so from it... especially if theres a little dew in the air..