Broadband radiometric LED measurements
2016
At present, broadband radiometric LED measurements with uniform and low-uncertainty results are not available.
Currently, either complicated and expensive spectral radiometric measurements or broadband photometric LED
measurements are used. The broadband photometric measurements are based on the CIE standardized V(λ) function,
which cannot be used in the UV range and leads to large errors when blue or red LEDs are measured in its wings, where
the realization is always poor. Reference irradiance meters with spectrally constant response and high-intensity LED
irradiance sources were developed here to implement the previously suggested broadband radiometric LED measurement
procedure [1, 2]. Using a detector with spectrally constant response, the broadband radiometric quantities of any LEDs or
LED groups can be simply measured with low uncertainty without using any source standard. The spectral flatness of
filtered-Si detectors and low-noise pyroelectric radiometers are compared. Examples are given for integrated irradiance
measurement of UV and blue LED sources using the here introduced reference (standard) pyroelectric irradiance meters.
For validation, the broadband measured integrated irradiance of several LED-365 sources were compared with the
spectrally determined integrated irradiance derived from an FEL spectral irradiance lamp-standard. Integrated
responsivity transfer from the reference irradiance meter to transfer standard and field UV irradiance meters is discussed.
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