What is Visible Transmittance?

Visible Transmittance (VT) is the amount of visible light that is transmitted from the outside through to the inside.

One of the main purposes for putting windows in a building is to provide daylight and a view for the occupants within.

However, some characteristics that increase the energy efficiency of windows can decrease their ability to perform this task. For instance, double glazing allows a little bit less daylight to come through the windows than single pane glass. While this amount of reduction in VT is hardly noticeable, tints and films can further decrease the VT.

A lower solar heat gain coefficient usually comes with the trade-off of lower visibility transmittance.

However, new technology such as CozE HV glass as part of the double glazing makes windows have the best of both worlds!

CozE HV glass maintains high transmittance of visible light wavelengths while restricting wavelengths that are primarily heat.

In some cases it is not important to have high VT. Some people like the extra privacy afforded by a darkly tinted window and don’t mind the decrease in light transmission, especially in very sunny, hot areas.

In office buildings, where controlling glare is very important, a low VT is often desirable.

The VT rating indicates the percentage of visible light hitting the window that is transmitted through to the inside.

The VT is an optical property that indicates the amount of visible light transmitted.

It is expressed as a value between 0 and 1. The higher the VT, the more light is transmitted.

The amount of VT required depends on the position of the window in the house, its relationship to the sun and the desired effect that light will have on the room.

Whatever your preferences Green Energy Windows can supply the type of window style and glass that will best suit your requirements for Visible Transmittance.

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