The 819D-UV-5.3-CAL is a NIST traceable calibrated integrating sphere detector using a 5.3 inch integrating sphere with a high performance silicon photodetector. The input port size is 0.5 in. diameter and the wavelength range is 200 – 1100 nm. For a very high power level, elevated temperature of the integrating sphere system can affect the measurement accuracy so the sphere must be temperature controlled. We recommend purging the inside of the sphere to avoid potential photo contamination with UV illumination.