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It is the ratio of visible solar energy (380 to 750 nm) that passes through a glazing system to the total visible solar energy falling on the system.

It is the total percentage of visible light reflected by a glazing system that can be seen visually.

This is the ratio of solar ultraviolet energy (300 nm to 380 nm) that is transmitted by the glazing system to the total solar ultraviolet energy falling on the glazing system.

It is the ratio of the total solar energy passing through a glazing system to the amount of total solar energy falling on that glazing system.

This is the ratio of total solar energy directly reflected by the glazing system to the amount of total solar energy falling on that glazing system.

The ratio of total solar energy directly absorbed by the glazing system to the amount of total solar energy falling on that glazing system.

It is the sum of incident solar energy rejected by a glazing system (solar energy reflectance and part of solar absorption which is re-radiated outward).

Shading Coefficient is the ratio of solar heat gain through a given glazing system to that of a standard plane glass (1/8 inch or 3mm thickness) under the same test conditions. Lower the shading coefficient value, better is the sun control capability.

Ratio of visible light transmission to shading coefficient for a glazing system.

The fraction of incident solar radiation that actually passes through that window, including solar energy that is both directly transmitted and that which is absorbed and subsequently released inwardly by re-radiation and conduction. SHGC is expressed as a number between 0 and 1. The lower a window's solar heat gain coefficient, the less solar heat it transmits. This number is the mathematical complement of the TSER value: The sum of the TSER (Total Solar Energy Rejection, in decimal form) of a glazing system and its SHGC value is 1; therefore, 1 - TSER = SHGC.