What Is Visible Light Transmittance?

 

Reducing the amount of solar radiation transmitted through glazing can reduce the amount of daylight entering your home. The amount of light transmitted by glazing is specified by the visible light transmittance, which is recorded as either TVw (visible transmittance of the window) or VLT (visible light transmittance). Both mean exactly the same. While the VLT rating varies between 0 and 1, most double glaze3d windows rate between 0.3 and 0.7 . The higher the value, the better

A simple way to consider this is:

Low TVw = too dark inside = lights on = higher energy costs.

How to maximize daylight?

Historically, only clear glass was used to maximize the amount of light entering through a window. Especially in cooling-dominated climate, this desirable daylight also came with undesirable solar heat gain. With the advancement of high-performance glazing systems, it is possible for low-Ecoatings to reject the solar heat gain while allowing the visible light to pass through the glass. The type of low-E coating that is appropriate for your specific house depends on location, orientation, window area, and shading strategies. (courtesy Efficient Windows Collaboration)

Light Tutorial: Transmission, Reflection, Absorbtion, Diffraction.

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