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NEMA’s Lighting Systems Index posted a modest increase of 2.4 percent on a quarter-to-quarter basis during the second quarter of 2013. This quarterly advance marked the LSI’s third consecutive increase. On a year-over-year basis, lighting equipment shipments climbed 4.9 percent. Increased demand for fixtures, emergency lighting and miniature lamps buoyed the index by compensating for decreases in ballasts and large lamps.