Solar energy reaches your cabin as visible light, ultraviolet light and infrared energy. Visible light is what you see and what determines how bright the interior feels; infrared is invisible but carries much of the heat you notice through a window; ultraviolet is the part associated with fading of trim and upholstery. Kepler's nano-ceramic films are constructed to work across that spectrum, with particular attention to infrared, which is why a lighter shade in the range can still help with cabin heat. Because visible light transmission and solar heat performance are measured separately, the darkest film is not automatically the coolest one. Ask your installer to show you the figures for the exact films and shades you are choosing between, on the windows you plan to tint, and you will have a clear basis for the decision.
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