National Technical Systems Inc. said it has acquired Lighting Technologies, an engineering services and testing laboratory.

The Calabasas provider of testing and engineering services said it paid $6 million in cash, plus up to $1 million for a potential earn-out, for Lighting Technologies of Pittsfield, Mass. The company had sales of about $4.6 million in the 12 months ended July 31.

Lightning Technologies specializes in lightning protection and caters to the aerospace, construction and wind power generation markets. It said the deal will strengthen its non-defense industry business.

“While LTI is a niche business, it is a very important one,” Chief Executive Officer William C. McGinnis said in a statement. “It complements our current capabilities and the testing services provided by LTI are a staple requirement for many commercial aerospace applications, as well as for a number of other commercial and industrial applications.”

Shares closed down 2 cents, or less than 1 percent, to $4.98 on the Nasdaq.