The G-Value, or solar gain coefficient, quantifies the amount of solar energy that passes through a window or glazing system. This post will explain what G-Values are, whether higher or lower values are better, and how they relate to different glass types. What are G-Values? G-Values indicate the percentage of solar. . Solar Factor or Total Solar Energy Transmittance or g-value (g%) is the total solar radiation transmitted by the glass. Shading Coefficient (sc) is Solar Factor divided by 0. It is a measure of the solar heat gain referenced to 3 mm clear glass which has the designated value of 1. U-Value. . What key parameters define the optical properties of photovoltaic glass? The key optical parameters are the Visible Light Transmission (VLT) and the Solar Factor (g-value). It is expressed as a decimal fraction, where a higher G-Value indicates that more solar heat is. . The Glass G Value is a crucial parameter in building design, especially when considering energy efficiency and comfort in indoor environments. The concept of Glass G. .