Unlike vitamin D supplements, phototherapy provides a more natural means of vitamin D production. While research has shown that the vitamin D received from supplements is functionally equivalent to that synthesized from natural sunlight, evidence suggests that vitamin D sourced from sunlight remains active in our bodies longer than vitamin D derived from dietary supplements. Studies have further demonstrated that compared to natural sunlight, UVB LEDs are more efficient and more effective in producing vitamin D3 in skin.
This technology relates to solid-state devices as replacements for incandescent light bulbs. The LED based bulb uses the normal Edison socket, but the LED and heat sink are placed on the far end of the bulb. The heat sink attaches to the bottom and outside of the bulb providing a structural base for the LED. Several alternative shapes for the light guide are provided to optimize the light emitted both in quality and quantity (i.e., more closely matching that of white incandescent bulbs).
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.