Light to Solar Gain Ratio (LSG)
Last Updated: May 9, 2024
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Light to Solar Gain Ratio (LSG)
Light to Solar Gain Ratio (LSG)
Share via E-mailLight to Solar Gain Ratio (LSG) is a measure used to evaluate the energy efficiency of window glass. It compares the amount of visible light that a window allows to pass through (Visible Light Transmittance or VLT) to the amount of solar heat gain that the window allows to pass through (Solar Heat Gain Coefficient or SHGC). The ratio is expressed as a numerical value, typically ranging from 0 to 2.
Formula: LSG = VLT / SHGC
Interpretation: A higher LSG indicates that a window allows more visible light to pass through while blocking more solar heat. Conversely, a lower LSG indicates that a window allows less visible light to pass through while allowing more solar heat to enter.
Key Factors Affecting LSG
Glass Coatings: Cardinal’s LoĒ™ coatings may increase LSG by carefully reducing SHGC while ensuring high VLT.
Glass Thickness: The thickness of the glass can affect the LSG by influencing both VLT and SHGC.
Benefits of a High Light to Solar Gain Ratio
Improved Energy Efficiency: Windows with a high LSG point to a better overall reduction in solar heat gain, reducing the heating or cooling load.
Enhanced Daylighting: High LSG windows allow more natural light to enter while minimizing solar heat gain, contributing to improved indoor lighting and reduced energy consumption.
Increased Comfort: By blocking solar heat while allowing visible light to pass through, high LSG windows create a more comfortable indoor environment.
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