Based on patented SPD technology developed by Research Frontiers, VariGuard optimally protects artifacts by limiting their light-exposure only to those times when people want to view them.
VariGuard’s ability to control an artifact’s light exposure begins with a thin light-control film that is laminated between glass or plastic substrates. This film contains millions of nano-scale particles. When no electrical voltage is present, the particles randomly orient and block visible light, thus protecting the artifact. When an electrical voltage is applied, the particles align and allow light to pass through the glazing, which enables the artifact to be seen and enjoyed. If needed, an unlimited number of intermediate light-control states are available simply by regulating the voltage to the film.