Rosslyn, Va.-based National Electrical Manufacturers Association (NEMA) has published BL 2-2009, "Energy Efficiency for Electronic Ballasts for T8 Fluorescent Lamps." The standard was developed by ...

A new standard contains energy-efficiency requirements for evaluating electronic ballasts designed for use with 4-ft, 32-W T8 fluorescent lamps. The National Electrical Manufacturers Association (NEMA ...

In part 1 we discussed rectifying the ballast AC current to DC and we showed an open load protection circuit. Direct replacement of fluorescent tubes with LED assemblies can lead to uneven lighting.

With the rapid development of high brightness LEDs, SSL (Solid State Lighting) is no longer a niche market. In commercial buildings and department stores LED fixtures are chosen over fluorescents ...