The percentage of total visible light that is reflected out by a glazing system.
A glazing system with a high VLR means that most of the daylight is not passing through the window.

The percentage of total visible solar energy that is allowed to pass through a glazing system - the higher the percentage, the more light will pass through the film.

The percentage of how much ultraviolet solar energy is rejected / prevented from passing though the film.

The total amount of infrared rays rejected by the film - the higher the number, the higher the infrared rays rejected.

The portion of total solar energy that is neither transmitted nor reflected by the film.

U-factor indicates the heat energy level, independent of the sun's radiant energy, that passes through a glass and window film
- a lower u-factor number means better heat retention inside a building in cold weather - it is also good for keeping buildings & cars cool in hot weather.

Emissivity is the insulating quality of a film - low emissivity films allow very little heat to pass through the material where they can reflect a large portion of the heat generated on a building's interior back inside (good for colder climates). In warmer climates, they can prevent outdoor heat from getting inside through the windows.

The ratio of heat passing through the film
- the lower the shading coefficient number, the better the shading quality of the film.

This is similar to the shading co-efficiency except that this also takes into account the energy that is -re-radiated back in to the room from the glass
- the lower the SHGC, the better the solar control properties of the film will be.

The percentage by which visible light transmission is reduced by the addition of a filtering material - the greater this number, the better in terms of reducing harsh or excessive light.

The percent of solar energy rejected by a film. This value equals solar refectance plus the part of solar absorption that is both re-radiated and conducted / convected outwardly
- the higher this number, the better.