Our certified lamp standards provide known luminous or spectral radiant flux and are used to calibrate integrating sphere photometers and spectroradiometers. The same screened and seasoned bulbs are also available uncalibrated as "optical grade" lamps which can be used to create transfer standards. We also offer the first, commerically available standard of of forward spectral flux and a standard of spectral irradiance which also doubles as a standard of spectral radiant intensity.
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