Accurate assessment of External Quantum Efficiency (EQE) in real-world environments is challenging, especially when individual cells in the module are non-identical due to degradation and field exposure. Researchers at NCPRE have worked on this problem successfully. The NCPRE study demonstrates the feasibility of measuring the (EQE) of photovoltaic (PV) modules under outdoor conditions using natural sunlight as the bias light (see figures on next page). Experimental validation on a degraded commercial 60-cell PV module shows that reliable EQE measurements can be achieved outdoors, enabling in-field, non-destructive evaluation of cell performance and degradation without requiring laboratory-based setups. The work was reported recently by Naga Bhavya Jyothi Kasagani, Tarun Sahu, K.L. Narasimhan, B.M. Arora, and Narendra Shiradkar in their paper “Analysis of external quantum efficiency measurements of degraded solar cells embedded in solar in solar modules,” Solar Energy, vol. 302, 2025, 114031; ISSN 0038 092X, https://doi.org/10.1016/j.solener.2025.114031.