NEMA’s shipment indexes for high intensity discharge (HID) lamps declined on a year-over-year basis (y/y) for the fourth consecutive quarter in 2013Q1. Shipments of sodium vapor lamps decreased 14.1 percent (y/y) to an index reading of 71.2 during the quarter. Mercury vapor lamp shipments were down a similar magnitude at 13 percent (y/y) to 44.2, [...]