Some interesting material regarding degradation of LED lights here: https://www.researchgate.net/publication/330676601_Degradation_of_optical_materials_in_soli

Some interesting material regarding degradation of LED lights here: https://www.researchgate.net/publication/330676601_Degradation_of_optical_materials_in_solid-state_lighting_systems https://www.researchgate.net/publication/330676601_Degradati... They note that "Chromaticity shift in the output light is one of the most common failures in LEDs [...] [Chromaticity shift] is considered as one of the most important measures of quality and is often studied and reported" (page 6) so it sounds like this could hardly be new info to the manufacturer.