Solar energy reaching your Tesla's glass includes visible light, ultraviolet and infrared, and infrared is the part most people notice as heat on the skin and in the cabin. Nano-ceramic films such as Kepler's IR and IR+ ranges are designed to address solar heat while keeping the view out clear, which can make the interior more comfortable and reduce the glare that tires your eyes on bright roads. Because visible light transmission is separate from solar heat performance, a lighter shade is not automatically the weaker choice; check the figures published for the exact film and shade rather than judging by how dark it looks. Your installer can compare the options against your Tesla's glazing and how you use the car.