Mangal instrumentation manufactures goniophotometers. It come in rotating luminaries gniophotometers, moving mirror goniophotometers , and rotating mirror goniophotometers from sensing to achieve measuring way a-a, b-b, and c-g. Measurement parameters include spatial intensity distribution, intensity distribution curve of each side [represented by right-angled coordinates or polar coordinates!. Spatial isointensity curve on the plane, luminance limitation curve, zonal flux, glare grade, luminarie efficiency, effective beam angle, upward and downward luminous flux ratio, total luminous flux, utilisation factor, electric parameters [voltage, current, wattage, power factor!, etc, of luminaries for road lighting, rool lighting and projecting lighting, reflector lamps, etc.
