Leightner Electronics, Inc Phone: 972) 542-0176 - Fax: 972) 542-2954 - 1501 S. Tennessee, McKinney75069 Leightner Electronics, Inc (LEI) was founded by Paul E Leightner in 1968 in Plano, Texas, and moved to its present location in 1975. Typical applications include ground and airborne military hardware, space, downhole test and drilling equipment, as well as other industrial applications.