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NEMA’s shipment indexes for high intensity discharge (HID) lamps returned to positive growth territory during the first quarter of 2012, with each lamp type showing year-over-year gains following negative growth to close out the final quarter of 2011. Sodium vapor lamps increased 2.9 percent, while shipments of mercury vapor and metal halide HID lamps increased 5.0 and 0.1 percent, respectively.