 Nlight NASDAQ:LASR was upgraded by Zacks Investment Research from a sell rating to a hold rating in a note issued to investors on Tuesday, Zacks.com reports. According to Zacks, nLIGHT Inc. provides high-power semiconductor and fiber laser. It sells its products primarily in industrial, microfabrication, aerospace and defense markets. nLIGHT Inc. is based in Vancouver, ... 