The National Electrical Manufacturers Association (NEMA) has published LL 9-2009 Dimming of T8 Fluorescent Lighting Systems. This new standard is the first coordinated guidance from the lighting industry on the dimming of T8 fluorescent lighting systems. LL 9 covers ranges between 100 percent and approximately 35 percent output (60mA lamp current). The publication is a result of discussions between numerous manufacturers and end-users as well as years of data gathering, testing, and analysis.

"This standard is an important step forward into the harmonization of dimming solutions for T8 fluorescent systems," says S. Pekka Hakkarainen, Lighting Division vice chair and Task Force on Fluorescent Dimming Standards chair, in a NEMA press announcement. "As programs for energy efficiency and for the effective application of lighting receive more and more attention, this standard and those that follow will provide much needed guidance to the marketplace. This standard will serve as a tool for both legislators and lighting planners to use in encouraging and designing effective T8 dimming systems." LL 9 may be downloaded at no charge, or a hardcopy purchased for $36, by visiting