NEMA’s shipments indexes for high intensity discharge (HID) lamps declined in the third quarter of 2015. Sodium vapor lamp shipments fell 12.3 percent compared to the same period last year, shipments of mercury vapor lamps decreased by 16.3 percent year-over-year, and shipments of metal halide lamps decreased by 14.5 percent year-over-year. 

Sodium vapor lamps accounted for 3.7 percent of high intensity discharge lamp sales in 2015Q3, while mercury vapor and metal halide lamps accounted for 33.2 percent and 63.1 percent, respectively.