NEMA’s T5 and T8 linear fluorescent lamp indexes surged upward 6.3 and 15.7 percent on a year-over-year basis (y/y), respectively, during 2013Q1. Moreover, the T8 index value of 120.2 was the second highest in the history of the series. Meanwhile, the index reading of 173.9 for T5 lamps was the highest since 2011. Not surprisingly, the index for T12 lamp shipments continued to diminish, posting a decrease of 38.9 percent (y/y), settling at a value of 36.5 for the quarter.
 
T8 lamps increased in market share by 2.2 percentage points reaching 75 percent. The increase came at the expense of T5 and T12 lamps. T5 lamps garnered a share of 10.1 percent, a decrease of 0.2 percentage points. Shipments of T12 lamps gave back the remaining 2 percent during the quarter, dipping to a share of 14.9 percent.