The 63976-45QC-OA is a complete QTH light source featuring the 63358 45 W QTH Lamp, with NIST traceable calibration over a 300-2400 nm wavelength range. NIST traceable calibration is a useful advantage for calibrating other lamps or complete spectroscopy systems. This light source comes with a Certificate of Calibration and all components necessary to operate the lamp. The 63966 Open Air Lamp Mount is an economical option to typical lamp housings that restrict the distance the lamp can be placed from the sample and require difficult and expensive swapping of condenser lens assemblies if different light output characteristics are required. Minimum light ripple from the lamp is a result of the highly precise, constant current supplied from the included OPS-Q250 power supply.   Lamp replacement is typically recommended after 100 hours of use to maintain certificate value uncertainties.