PLS Electronics
Hungarian manufacturer of the Pegasus line of dimmers.

Electronics Diversified, Inc. (EDI)
Manufacturer of theatrical consoles, dimmers, and related products, as well as architectural lighting.

Electronic Theatre Controls (ETC)
Manufacturer of lighting consoles, dimmers, fixtures, accessories, and controllers for the theatrical and architectural markets.

Diversitronics, Inc.
Manufacturer of strobelights, stage lighting, light chasers, and dimmers. Contains company profile and product information.

Forbes and Lomax
Specialists in designer and invisible light switches, dimmers and socket outlets. Site has catalogue, and a wallpaper-switch color matching applet.

NSI Corporation
Lighting controllers and dimmers for theater, touring, and architectural applications. Includes link to brochures of Colortran products also.

Avolites Ltd.
Lighting consoles, dimmers, accessories.

Lutron Electronics 
Lighting controls and dimmer manufacturer and designer. Architecture, residential applications, and interior design lighting information.

Futronix Ltd
Home dimmers to high-end commercial lighting control systems.

Rosco Entertainment Technology
Colorfilters, dimmers and control equipment manufacturer.

Vics Electronics
Offers a range of light dimmers that are installed at the lamp socket. Product catalogue and shopping cart.

Toyama
Makers of electrical switches, regulators and dimmers.

StageLight
Sales, installation and rentals of theatrical lighting fixtures, dimmers, control, followspots, moving lights, foggers and expendables. Offices in New Orleans and Houston.

Digilight
French manufacturer of digital dimmers for theatre and touring. The company also carries various other control equipment.

Kupo Company Ltd.
Taiwanese manufacturer of theatrical lighting equipment. Dimmers, fixtures, parts, and accessories.