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 four-foot 32-watt T8 fluorescent lamps
with a lumen output greater than or equal to 3100 lumens. It covers
definitions, requirements, and markings. Ballasts that meet these
requirements are labeled NEMA Premium.

“In NEMA BL 2-2009, [the] ballast section has expanded the NEMA
Premium program for T8 fluorescent ballasts to include additional
ballast types, and has refined the performance requirements for
products already in the program,” said ballast section vice chair John
Green.

More information on the standard and purchasing options are available HERE through the company’s website.