NEMA’s T12 lamp shipment index tumbled to 37.5 a decline of nearly 40 percent on a year-over-year (y/y) basis during Q3 – the first quarter following the implementation of the new efficiency standards for general service fluorescent lamps (GSFL). T8s and T12s also posted double digit declines of 26.9 – and 19.9 percent, respectively. Overall shipments during the first three quarters for the combined market were 15.1 percent lower compared to last year.
 
T12 lamps posted a precipitous decline in market share, dipping 8.6 percentage points to 19.2 percent. T8 lamps absorbed a majority of the market share lost by T12s, gaining 7 percentage points for a share of 69.8 percent. Garnering the remaining 1.6 percentage points given back by T12s, T5 lamps increased to an 11.0 percent share.