>and must, due to the laws of thermodynamics, not be 100% transparent.
It's perhaps worth noting, however, that it wouldn't be unusual for a window to have only ~60% transmittance in visible spectrum.
It's perhaps worth noting, however, that it wouldn't be unusual for a window to have only ~60% transmittance in visible spectrum.
Oh no! How do I check if I'm getting counterfeit sunlight?