The OL 459 Tunable Light Standard is a NIST-traceable radiance/luminance calibration standard ideal for such applications as camera/image sensor calibration, diagnostic medical imaging, and technical/industrial photography. A 6-inch diameter integrating sphere and display panel are used to monitor and adjust the driving current and luminance of 5 separate, temperature-controlled LED channels. PTFE coating provides a highly diffuse reflectance over the visible and into the NIR wavelength range. 

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