When the sun starts shining and the temperature rises, SolarSmart self-tinting glass from Innovative Glass automatically darkens to reduce light and keep interiors cool. Then, when the sun sets, the tint fades. Since the glass is 100 percent solar-activated, it requires no power, wires, or control systems, which helps to keep installation simple. The glass is a good fit for curtain walls, atriums, and skylights. The need for blinds and drapes is reduced, and the company says that buildings with self-tinting glass will see between 20 and 43 percent in annual energy savings. Professional Builder