Solar energy reaching the glass includes visible light, ultraviolet and infrared, and the infrared portion is the part people feel most directly as heat. Kepler's nano-ceramic films act on that solar energy at the glass, so less of it reaches the cabin and the interior stays more comfortable, with less work for the climate system once you set off. Because the ceramic layer does the work, the lighter shades in the range are worth considering alongside the darker ones. Visible light transmission simply describes how much light passes through and is a separate figure from solar heat performance, so compare the exact film and shade you have in mind. The published data for each option is the best guide, and the dealer handling your enquiry can help you match it to your Tesla and the finish you want.