Performance metrics & physics
Solar Energy Absorbed
Solar energy absorbed is the fraction of incoming solar radiation that is taken up by a window film or glass and converted to heat within the material itself.
Absorbed solar energy doesn't immediately enter the cabin — it heats the film and glass first, then re-radiates outward and inward over time.
A film with high absorption but moderate reflection can still perform well on total solar energy rejection if the absorbed heat is shed primarily to the outside. The energy balance is what matters.
This is why total solar energy rejection, not just visible reflectivity, is the better cross-film comparison. A film can reject heat by reflecting OR by absorbing-and-re-radiating-outward.