Y si ya lo quieres pasado por la ciencia, te copio post de LarryM del foro americano de la Honda 1800 Goldwing:
Helmet color vs temperature - GL1800Riders
Para leer todo el hilo:
Si solo quieres leer las conclusiones:
"Conclusions.
The first sample had me scratching my head, until I realized the mistake I had made. But I knew that the temps would stabilize, and it would not affect the subsequent samples.
1. The test proves that it is indisputable that at a standstill, a black helmet not only gets hotter inside, but a lot hotter.
2. With a surface temperature 55 degrees above ambient temperature, the black helmet was obviously absorbing a massive amount of heat. The extremely high temperature of the black outer shell prevented the inside of the helmet from cooling down. While the inside of the silver helmet cooled down under cloud cover due to the lower external surface temperature, the inside of the black helmet continued to rise, even though the outer temperature dropped. Getting the helmet out of the sun did not provide any relief inside the helmet.
3. Even though this test was done at a standstill, I do not believe that hot 90 degree air flowing over a helmet at speed could have made much of a difference in reducing inside temperatures. Not only that, but on a Goldwing, not that much air hits the helmet.
4. I had hoped for continuous sun. But the presence of clouds at the end of the test turned out to be a blessing. It shows that once you stop, even for a short time, the temps rise so rapidly on the outer surface of a black helmet, that once you start moving, it can never recover.
5. The temperatures of both helmets reached their peak fairly rapidly, and then either stopped rising, or rose at a lower rate.
6. I was very surprised that the internal temperature of the Silver helmet only rose about 6 degrees above ambient temperature up to 45 minutes. I think this may prove that wearing a helmet is cooler than no helmet. I may go out in the Sun tomorrow and measure the temperature of my bare head after 15 minutes.
7.Those who believe their black helmets are not any hotter are kidding themselves.
I did not have time to make this a highly detailed experiment. But the results are so skewed that the limited samples provided all the data that was needed. I believe this is the only actual experiment that has been done on this subject. Everything else on the Internet is only opinions, which vary wildly. I think that my test now proves the answer definitively. I would like to put the probes inside the helmet and test the helmets while moving, but then I would not be able to return them. "