The Invisible Plate Rotary Dimmer by Forbes & Lomax is a transparent acrylic rotary dimmer — push to switch on/off, rotate to dim and brighten. Available in 1- to 4-gang configurations. The Invisible line was inspired by the glass plates of the 1930s, designed to showcase unique wall treatments such as wallpaper and lime wash. Each unit includes two wall plates: a clear lucite top plate and a white metal backplate. When installed over stone or tile, the white metal backplate may require faux painting to blend with the surface.

Established in 1987, Forbes & Lomax is a UK-based heritage electrical brand recognized by architects and designers for refined switch and outlet design.

Rotary dimmers, toggle switches, and push buttons can be configured on the same plate. To guarantee compatibility — especially with higher wattage lights, drivers, or non-replaceable LEDs — email or upload light specifications before purchase.

Specifications

Knob: Ø 20 mm (0.79")
1 Gang: W 70 mm (2.76") x H 115 mm (4.53")
2 Gang: 115 mm (4.53") x 115 mm (4.53")
3 Gang: W 162 mm (6.38") x 115 mm (4.53")
4 Gang: W 210 mm (8.27") x 115 mm (4.53")
Available Configurations
LED: max. 120W LED or 300W incandescent/halogen (TRIAC)
Incandescent: max. 500W incandescent/halogen
MLV: max. 600VA magnetic low voltage halogen (contact us)
0-10V (Linear): max. 20 0-10V dimmable drivers (contact us)
Non-dimming: max. 720W any load type, ON/OFF only (contact us)
Certifications
Rotary dimmers conform to UL 1472, certified to CSA C22.2 No. 184
Important Notes
All dimmers are supplied as 3-way; can be used as single-pole. Only one dimmer per 3-way or 4-way circuit — other locations require non-dimming toggle switches.
LED dimmers are forward-phase TRIAC. On-board programming enables adjustment of min/max dimming levels. Follow "optimizing your dimmer" instructions after installation and apply the child lock to retain settings.
Not all LED fixtures are compatible. Contact us with light fixture specs to confirm compatibility.
Must be installed by a licensed electrician. Units install into standard junction boxes — boxes must be recessed below the finished wall surface by at least 1/8". Verify recess depth before ordering.
Areas of application: light-duty commercial, residential.

Materials

Acrylic plate. Metal fittings available in:

Unlacquered Polished Brass
Nickel Silver
Brushed Stainless Steel
Antique Bronze
Matte Brass

Unlacquered Polished Brass is a living finish that changes colour over time. Wipe clean with a dry, non-abrasive microfiber cloth. Avoid chemical or alcohol-based cleaners. Refer to the care guide for best practices.

Product Downloads

Product Sheets

Installation & Care

Dimmers

Invisible Plate Rotary Dimmers by Forbes & Lomax

Invisible Plate Rotary Dimmers by Forbes & Lomax