• Superior Electric

• Swanson & Youngdale, Inc.

• Sylvan Designs

• TEKA Illumination

• THOR Systems, Inc.

• Territo Electric, Inc.

• Tescor, Inc.

• The E.L. Foust Co.

• The L. C. Doane Company

• Theatrical Lighting Systems, Inc.

• Thomas & Betts Electrical

• Thomas Lighting Group

• Tortran

• Trimblehouse Corp.

• Tristate & Electric & Electronics Supply Co.

• U.S. Architectural Lighting

• Union Metal Corp.

• Union Mfg. Co.

• Universal Lighting Technologies, Inc.

• Ushio America

• Utility Concrete Products Co.

• Vantage Lighting, Inc.

• Varco International, Inc.

• Venture Lighting International

• Visa Lighting Corporation

• Visco