The article discusses how anti-reflective coatings (ARC) on solar panels and greenhouses can lose effectiveness due to abrasion, leading to reduced energy efficiency. The researchers developed a method using reflection spectroscopy to measure ARC performance and transmittance. They tested standard ARC coatings with and without reflection suppression to mimic real-world conditions. By comparing experimental results with calculations, they validated their method. The study shows that gradual abrasion of ARCs can be quantitatively assessed using this approach.