G

Glossary

VT

abbr. visible light transmittance

A metric of the amount of visible light that passes through the glazing material of a window, door, or skylight. VT theoretically varies between 0 and 1, but most values among double- and triple-pane windows are between 0.30 and 0.70. The higher the VT, the more light is transmitted.

Variants: VLT, Tvis

Related resource: The Future of Window Technology . . . Is Here!; Windows and Occupant Comfort