Sunlight arrives at the glass as visible light, ultraviolet and infrared energy, and much of the heat you feel in the cabin comes from the infrared part you cannot see. Kepler's nano-ceramic films are built to address that energy at the window along with ultraviolet light, which is why a lighter shade can still work hard on heat. Visible light transmission describes how much light passes through and how the car looks; it is a separate measure from solar heat performance, so compare the figures for the exact film and shade you are considering.
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