Patent ID: 7588067

Claim:
A system for reducing sun glare through an opening into a space, the system comprising: an electrically controllable window treatment operable to alter the amount of daylight entering the space through the opening; a first sensor mounted within the space and characterized by a sensor gain, the first sensor operable to sense a level of illumination in the space; and a control system characterized by a dead-band having an upper threshold and a lower threshold, the control system operable: to adjust automatically in response to a present time of day when glare from the sun can occur through the opening at least one of: (a) the upper threshold of the dead-band, (b) the lower threshold of the dead-band, and (c) the sensor gain of the first sensor; to compare the sensed illumination level in the space to the dead-band; and to adjust the window treatment automatically in response to the comparison of the sensed level of illumination to the dead-band to reduce the sun glare.