NEMA’s high intensity discharge (HID) lamp shipment indexes declined for the second consecutive year during 2012.  Mercury vapor lamps declined 9.6% to an index value of 44 signifying that shipments during 2012 were 44% of the 2006 base level. The index for sodium vapor lamp shipments fell 6.2%, landing at 75. Metal halide lamps posted an index reading of 80, declining by 4.9% for the year.

The relative market shares for each HID lamp type were essentially unchanged with respect to the previous year. Metal halide lamps garnered the largest share with 63.5%. Sodium vapor lamps had a share of 32.5% followed by mercury vapor lamps with a 4.0% share for 2012.