The Role of Standard and Supplementary Observers in Accurate Illuminance measurements
Authors: Listowski Maciej 
Published: October 2024

Typically the sensitivity V2 (λ) for a 2° standard observer is used at photometric measurments. Nevertheless, the light reach the human eye from wider field of view. This fact motivated the International Commission on Illumination to introduce the 10° supplementary observer with sensitivity V10 (λ). This paper analyzes the impact of transition from V2 (λ) to V10 (λ) on measured pc-LEDs illuminance values. The results indicate that the maximum difference is 2% for 3000 K pc-LEDs, 4% for 4000 K pc-LEDs, and 6% for 6500 K pc LEDs. Full Text: PDF References

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