Demand for high intensity discharge (HID) lamps, as measured by NEMA’s HID shipment indexes, remained soft during 2013Q3. Seasonally adjusted shipments of sodium vapor lamps dipped 3.2 percent on a quarterly basis (QoQ), falling to a new series low. Similarly, mercury vapor lamp shipments reached the second lowest level in the series, declining by 5.5 percent QoQ. Metal halide lamps, the largest HID lamp segment, contracted by 1.6 percent QoQ.