- Visible light transmittance is the percentage of visible light (with a wavelength from 380 nm to 780 nm) that is permitted to be transmitted through the laminated glass. For instance, Viracons VH1 1-75 permits 82 percent of visible light to be transmitted through the glass, while the VH1 1-50 allows 50 percent of visible light to pass through. Other models in Viracons range permit much lower levels of visible light passage, such as the VH1 3-50, which permits 27 percent, and the VH1 3-40, which permits 20 percent.
- Solar transmittance is the percentage of visible, ultraviolet and near infrared energy (with wavelengths between 300 nm and 3000 nm) that is transmitted through the laminated glass. This value scales with the figure for visible light, so VH1 1-75 permits 48 percent of solar rays and VH1 1-50 permits 33 percent, while VH1 3-50 permits 18 percent and VH1 3-40 permits 12 percent.
- The visible light reflectance is the amount of visible light that is reflected from the laminated glass's surface. Visible light is both reflected inward (Vis-In) and outwards (Vis-Out). For instance, VH1 1-75 has a Vis-In value of 9 percent and a Vis-Out value of 9 percent. VH1 1-50 has a Vis-In value of 8 percent and a Vis-Out value of 14 percent. On the other hand, VH3 3-50 has a Vis-In value of 5 percent and Vis-Out value of 14 percent, while VH1 3-40 has a Vis-In value of 7 percent and a Vis-Out value of 14 percent.
- The solar heat gain coefficient (SHGC) is the amount of directly transmitted and absorbed solar energy that enters into the building's interior through the laminated glass. A higher value of SHGC indicates a higher heat gain. The VH1 1-75 has a SHGC value of 0.58, while the VH1 1-50 has a value of 0.48. The VH1 3-50 and VH1 3-40 possess lower levels of SHGC and thus a lower heat gain, with values of 0.38 and 0.32 respectively.
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