Glass, by its nature, is considered transparent to light, but it is only partially transparent to solar radiation. When a ray of sunlight hits a glass surface, the following phenomena occur: emission: part of the incident solar radiation absorbed by the glass is gradually released into the surrounding environment.
The main values in the choice of glass are thermal transmittance, light transmittance, and the solar factor. The solar factor g is the ratio between the solar energy that manages to pass through the glass entering the environment and the total solar energy that strikes the outer surface of the glazing.
Light transmission, on the other hand, represents the amount of light that the glass of a fixture allows to filter inside. The solar factor is a determining parameter in the design of a building, especially when the environments have large transparent surfaces, as it is able to quantify the heat that enters the internal environments.
The light transmittance (TL) expresses the amount of light transmitted through the glass. It is the percentage of light, visible to our eyes, that the glass of a fixture allows to filter into the internal environment. The higher the % value, the more the room will be naturally lit, saving on the use of artificial light sources.
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