Abstract: Dynamic mirror assemblies are disclosed that can vary the amount of light reflected, that include a mirror and a switching material. The switching material is placed between the mirror and a viewer, and has a dark state and a light state, and switches state in at least one direction due to a photochromic reaction, and switches in the other direction due to one or more of a photochromic reaction or an electrochromic reaction or a thermal reversion above a threshold temperature.

Abstract: Dynamic mirror assemblies are disclosed that can vary the amount of light reflected, that include a mirror and a switching material. The switching material is placed between the mirror and a viewer, and has a dark state and a light state, and switches state in at least one direction due to a photochromic reaction, and switches in the other direction due to one or more of a photochromic reaction or an electrochromic reaction.

Abstract: Methods, systems, and techniques for controlling a variable transmittance optical filter involve determining at least one of a temperature of, color of, and current flowing through the optical filter, and adjusting the voltage applied across the filter in response to at least one of the temperature, color, and current. The transmittance of the optical filter decreases until reaching a minimum on exposure to a first stimulus and increases until reaching a maximum in response to application of a second stimulus, and at least one of the first and second stimuli involves applying a voltage across the filter.