It's not stupid, but the test would be complex. E.g., one would have to model and output the relevant solar spectrum to heat the vehicle and see how it respond

It's not stupid, but the test would be complex. E.g., one would have to model and output the relevant solar spectrum to heat the vehicle and see how it responds to the IR heat load in maintaining human and battery operating temperature. Same with cold cycles, and the details get complicated when you try to average out the experienced conditions. One of Tesla's mileage advantages comes from using the most advanced multilayer mirrors in their glass to minimize the effect of radiant heating/heat loss. Fun aside: An interesting side effect of the technology is the appearance of red droplets when rain or dew is on the glass with the proper sunlight conditions: https://www.reddit.com/r/oddlysatisfying/comments/9ustsa/refraction_of_light_through_raindrops_on_the/ https://www.reddit.com/r/oddlysatisfying/comments/9ustsa/ref...