Visible Light Transmittance
Visible Light Transmittance or as it’s known Visible Transmittance (VT) is a measure of how much visible light passes through a glazing material such as a window, door, or skylight. The visible spectrum of sunlight is defined as the wavelengths that are visible to the human eye (380 to 720 nanometers).
A glazing product with a higher Visible Transmittance delivers more visible light in a space. If designed properly, this can offset electric lighting costs and its associated cooling loads.