Martin Professional A/S of Denmark has appointed Mats Karlsson as technology manager for its Visual Solutions business unit. Karlsson will be based out of Belgium.

Halco Lighting Technologies of Norcross, Ga., has appointed Ernest L. Johnson to the recently created position of product manager.

W.A.C. Lighting has expanded its corporate headquarters and East Coast warehousing and distribution center in Garden City, N.Y., by adding a second 35,000-square-foot warehouse, a state-of-the-art showroom and training center, and new offices.