NEMA's shipment indexes for T5 and T8 linear fluorescent lamps increased 30.2 and 12.5 percent, respectively, during the first half of 2011 compared to the same period last year. Moreover, the Q2 2011 index values for both T5 and T8 lamps were at record highs. Meanwhile, first half shipments of T12 lamps declined 11.1 percent on a year-over-year basis.
There were nominal variations in the market shares for each lamp type during Q2 2011. T5 and T8 lamps increased their share of the combined market by 0.2 and 0.1 percentage points to 7.6 and 62.4 percent, respectively. T12 lamps gave back 0.3 percentage points, decreasing to 30 percent in the lead up to next summer's phase-out of these lamps.