Thermoplastic LED lenses in greenhouse lighting can degrade over time, resulting in discolouring and failure of the optics. That's what researchers of Dow concluded from a study that… Thermoplastic LED lenses in greenhouse lighting can degrade over time, resulting in discolouring and failure of the optics. That's what researchers of Dow concluded from a study that evaluated the aging performance of commercially available lens clus... [2186 chars]