During 2012, NEMA's High Intensity Discharge lamp shipment indexes declined for second consecutive year. Mercury vapor lamps declined 9.6% to index value of 44 signifying that shipments during 2012 were 44% of the 2006 base level. Index for sodium vapor lamp shipments fell 6.2%, landing at 75, and metal halide lamps posted index reading of 80, declining by 4.9% for the year. Relative market shares for each HID lamp type were essentially unchanged with respect to previous year.
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