NEMA’s shipment indexes for high intensity discharge (HID) lamps declined by 11.7%, 17.1% and 0.9% on a year-over-year basis for sodium vapor, mercury vapor and metal halide lamps, respectively. For the year as a whole, shipments of mercury vapor lamps also declined for the fourth consecutive year, dipping 2.7% compared to 2009. Conversely, sodium vapor [...]