Solar energy reaching your Tesla arrives as visible light, ultraviolet and infrared, and together those make up the full heat spectrum. Infrared is the portion you feel most directly as warmth, and it is invisible, which is why a light film can still make a real difference to how the cabin feels. Kepler's nano-ceramic construction is designed to work across that spectrum rather than relying on darkness alone, so you can choose a shade for looks and still address heat at the glass. Because visible light transmission and solar performance are separate measurements, ask for the data sheet covering the exact film and shade you are considering and compare like with like.