IES LM-80-08 - Approved Method: Measuring Lumen Maintenance of LED Light Sources
IES TM-21-11 - Projecting Long Term Lumen Maintenance of LED Light Sources
NEMA ANSI C136.25-2009 - Roadway and Area Lighting Equipment - Ingress Protection (Resistance to Dust, Solid Objects, and Moisture) for Luminaire Enclosures