The Russian-owned NLMK plant in western Pennsylvania used to spend inordinate time and money replacing bulbs. Britain’s Dialight is correcting the problem with long-life LED lighting while ushering in energy savings and other benefits, as Mark Halper discovers. The Russian-owned NLMK plant in western Pennsylvania used to spend inordinate time and money replacing bulbs. Britain’s Dialight is correcting the problem with long-life LED lighting while ushering in energy savings and other benefits, as MARK HALPER discovers. When you operate a rough-and-tough steel mill where the furnaces hit 2300°F, where hydrochloric acid washes impurities from finished metal, where industrial rollers crank and churn as they flatten slabs down from 10 inches to 1-inch sheets and smaller, where welders’ arcs flare in the maintenance room and workers fight dust and dirt everywhere, the last thing you want to worry about is replacing lightbulbs. Yet that’s what they were doing at the 350-acre NLMK steel works in Farrell, PA, about 70 miles northwest of Pittsburgh, both inside the cavernous halls and outside on the roads, the parking lots, and at the pumping station along the She...