Work

The spectral mismatch correction factor estimation using broadband photometer measurements and catalog parameters for tested white LED sources

Year: 2024

Type: article

Abstract: • Accurate measurement requires photometers with excellent spectral responsivity. • Calibration is necessary when a photometer with poor spectral response is in use. • Simple look-up chart may substitute complicated and costly spectral measurements. • A look-up chart was developed with typical minimum and maximum of SMCF. • The method gives simple and accurate photometric evaluation of typical white LED. Using a modeled look-up chart developed in this work, we show that accurate photometric measurements of characteristics like illuminance or luminous intensity of test LED sources can be measured in one step. This is a simple broadband measurement that may substitute for complicated and costly spectral measurements currently in place. To develop the look-up chart, the typical minimum and maximum of the Spectral Mismatch Correction Factor (SMCF) for a given photometers was estimated in relation to catalog parameters of the LEDs such as correlated color temperature (CCT) and melanopic daylight efficacy ratio ( mDER ). This research was based on the unique and large dataset of real photometers spectral response s rel ( λ ) collected and measured at accredited laboratories located at America, Asia and Europe and modeled LED's spectral power distribution (SPD) data. Independent look-up tables were developed for color-mixed LEDs (cm-LEDs) and white phosphor-converted LEDs (pc-LEDs), two common LED types.

Source: Optics and Lasers in Engineering

DOI: 10.1016/j.optlaseng.2024.108614