Integrating spheres are used for a variety of optical, photometric or radiometric measurements. DES will measure the shear power spectrum as a function of photometric redshift. There are two parallel systems of quantities known as photometric and radiometric quantities. MACS0647-JD is the farthest known galaxy from the Earth based on the photometric redshift. It is a radiometric rather than a photometric measure. Like all photometric units, the lux has a corresponding "radiometric" unit. Many different units of measure are used for photometric measurements. Here, this distinction is indicated by a "p" subscript for photometric redshifts. The Kepler space telescope provided extended coverage of a single field with accurate photometric data. There are many astronomical applications used with photometric systems. More complex forms of photometric measurement are used frequently within the lighting industry. Astronomers have developed other photometric zeropoint systems as alternatives to the Vega system. CS3 has nine robotic observatories and is primarily focused on asteroid research and photometric studies. Computer modeling of outdoor flood lighting usually proceeds directly from photometric data. The lumen is the photometric unit of light output.