The National Electrical Manufacturers Association (NEMA) published NEMA LSD 63 Measurement Methods and Performance Variation for Verification Testing of General Purpose Lamps and Systems.

NEMA LSD 63 establishes variations that can be expected when independent verification testing, generally based on small samples of lamps or ballasts, is performed to estimate product performance characteristics and for comparison to manufacturer’s ratings.

NEMA LSD 63-2012 is available at no charge. 

NEMA is the association of electrical equipment and medical imaging manufacturers, founded in 1926 and headquartered in Arlington, Virginia. Its member companies manufacture a diverse set of products including power transmission and distribution equipment, lighting systems, factory automation and control systems, and medical diagnostic imaging systems. Worldwide annual sales of NEMA-scope products exceed $120 billion.