This invention is directed to a self-commissioning photosensor and controller device that turns electric lights on and off using a microprocessor connected to a luminaire. The processor receives signals from a self-commissioned mountable photosensor. The photosensor uses a unique algorithm to control illumination at the task pane making the photosensor more accurate than current market technologies. Light energy consumption can be reduced by up to 30% and commercial customers can be recompensed in as soon as one year after installation.
Most lighting level measurements are characterized in terms of illuminance.While this is useful for indoor applications, illuminance levels are not always as useful for outdoor lighting efficiency characterization.Lighting designers and researchers need a method to accurately characterize their outdoor or low level lighting applications. This invention is directed to a system for approximating the flux density of light on a human retina.Different tasks require different structures of the eye.