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Updated: Feb 27, 2026

Method for Recording Broadband High Resolution Emission Spectra of Laboratory Lightning Arcs

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Broadband Radiometric LED Measurements.

G P Eppeldauer¹, C C Cooksey¹, H W Yoon¹

¹National Institute of Standards and Technology 100 Bureau Drive, Gaithersburg, MD, USA 20899.

Proceedings of Spie--The International Society for Optical Engineering

|June 27, 2017

Summary

This summary is machine-generated.

New reference irradiance meters enable accurate broadband radiometric measurements for LEDs, overcoming limitations of existing methods in UV and visible ranges. This simplifies LED characterization with low uncertainty and without needing source standards.

Keywords:

LED LED integrated irradiance LED radiometric measurement UV-LED measurement blue LED measurement broadband measurement filtered-Si LED meter flat-response LED meter integrated radiometric quantities pyroelectric LED meter red LED measurements

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Area of Science:

Radiometry
Optical Engineering
Solid-state Lighting Metrology

Background:

Current broadband radiometric measurements for LEDs lack uniformity and low uncertainty.
Existing methods rely on complex spectral measurements or broadband photometric methods with significant limitations, especially in the UV range and at the edges of the visible spectrum.
Photometric measurements using the V(λ) function are inaccurate for UV and LED wavelengths outside the standard photopic curve.

Purpose of the Study:

To develop and validate a simplified broadband radiometric measurement procedure for LEDs.
To introduce reference irradiance meters with spectrally constant response for accurate LED characterization.
To enable low-uncertainty radiometric measurements of LEDs without requiring expensive source standards.

Main Methods:

Development of reference irradiance meters utilizing detectors with spectrally constant response.
Comparison of spectral flatness between filtered-silicon (Si) detectors and low-noise pyroelectric radiometers.
Measurement of integrated irradiance for UV and blue LED sources using the developed reference pyroelectric irradiance meters.
Validation through comparison with spectrally determined irradiance from an FEL spectral irradiance lamp standard.

Main Results:

Demonstrated a simplified broadband radiometric LED measurement procedure using spectrally constant response detectors.
Achieved low-uncertainty integrated irradiance measurements for UV and blue LEDs.
Validated the broadband method by comparing results with spectrally derived irradiance values.

Conclusions:

The developed reference irradiance meters and broadband procedure offer a viable alternative for accurate LED radiometric measurements.
This method overcomes the spectral limitations of photometric measurements and the complexity of spectral radiometric measurements.
The approach facilitates accurate and accessible LED characterization across various spectral ranges, including UV.