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No, low-E is not about UV - quite the opposite, it is about IR, specifically it is about the window having a low emissivity in the infrared spectrum.
A principle of physics is that an object's ability to absorb radiation is identical to the ability to radiate radiation - this is called the blackbody principle. A window with high emissivity will absorb more radiation if the environment is hotter than the window, and will radiate more if the environment is cold, as compared to a low emissivity window.
Then you add having a dry inert gas between panes to cut convection and conduction between the panes, and you have a modern high R value window.