NEMA’s incandescent lamps shipment index for Q3 2011 decreased 1.2% from the previous quarter, but was up 21.5% compared to the same period last year. The year-over-year percentage (y/y) change is the largest swing, in either direction, since 2008. Compact fluorescent lamp shipments registered a slight gain of 0.9% over Q2 2011. Yet, the index [...]