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OTD News Calibration Services Available for LED Luminous Intensity and flux NIST calibration services are now available for the total luminous flux as well as for Averaged LED Intensity for submitted LED's of limited types with an uncertainty of typically 1 % to 3 % (k = 2) depending on the characteristics of LED's. Measurement equipment and procedures for determining Averaged LED Intensity (defined by CIE 127) have been developed utilizing the NIST photometry bench. A capability for measurement of total luminous flux of LED's has been established using the NIST 2.5 m integrating sphere facility. Work continues in the Optical Technology Division at NIST to develop more versatile calibration facilities dedicated to LED measurements for luminous intensity, flux, and color with reduced uncertainties, and to make various standard LED's available for the industry.
Online: October 2001 |