Sunlight reaches your car as visible light, ultraviolet and infrared energy. Infrared is the part you feel as heat, and it is invisible, which is why a dark film is not automatically a cooler one. Kepler's nano-ceramic films are engineered to work across that spectrum rather than relying on depth of shade alone, which is what makes the lighter shades worth a look for owners who want the car to stay close to its original appearance. On a Tesla, with its large glass areas, that can mean a more comfortable cabin and less glare on a bright day. Solar heat performance is quoted per film and per shade, so ask your installer to compare the exact options you are weighing up rather than working from the shade name.