The National Electrical Manufacturers Association (NEMA) has published BL 2-2009 Energy Efficiency for Electronic Ballasts for T8 Fluorescent Lamps. The standard was developed by NEMA’s Ballast Section and revises the 2007 version. BL 2 contains energy efficiency requirements for evaluating electronic ballasts designed for use with 4-ft. 32W T8 fluorescent lamps with a lumen output [...]





