 Nlight NASDAQ:LASR was downgraded by Zacks Investment Research from a buy rating to a hold rating in a research report issued to clients and investors on Friday, 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 ... 