Discussion on:

Soladigm rakes in $30 million for auto-tint smart glass

Windows that can be tinted as needed would be a great step forward for green buildings as well as residences. This especially in southern climes where intense sun is a problem, you could have full light morning and evening and controlled radiation during peak sun hours. I don't think there would be a negative side to this if costs can be controlled.

Is this new? Transition lenses have been around for decades.