The 5000 FEL 1000-Watt tungsten-halogen Lamp Source System provides absolute calibration of spectral irradiance from 250 to 2500 nm. The system can be configured simply as a lamp (bearing the ANSI designation of FEL & calibrated to the 2000 NIST irradiance scale), or to include accessories such as a lamp holder, alignment jig, lamp housing, power supply and shunt box.  Lamp calibration is directly traceable to NIST, employing the 2000 NIST scale from 250 to 2400nm.