Between 2005 and 2010, Federal efficiency standards became phased into effect, covering fluorescent magnetic ballasts designed to operate full-wattage F40T12, F96T12 and F96T12HO lamps. Subsequent standards expanded this scope to include energy-saving versions of these lamps (e.g., 4-ft. 34W T12). In July 2010, efficiency standards regulating fluorescent magnetic T12 ballasts entered their final phase, effectively eliminating these ballasts from the market, with few exceptions.
The Lighting Controls Association has published a whitepaper I wrote on this topic here.
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