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2. Joel Spira (businessman) - Wikipedia

   en.wikipedia.org/wiki/Joel_Spira_(businessman)

   Joel Solon Spira (March 1, 1927 – April 8, 2015) was an American inventor, entrepreneur, and business magnate.. He invented a version of the light-dimmer switch for use in homes around the United States and led his Lutron Electronics Company into the production of lighting controllers.

3. Kliegl Brothers Universal Electric Stage Lighting Company

   en.wikipedia.org/wiki/Kliegl_Brothers_Universal...

   The company was also offering their "Dynabeam" lensed follow spot, and Fresnel lanterns ranging from 100 to 2000 watts. In that era of patch panels and small numbers of high wattage dimmers, Kliegl Brothers offered its "Safpatch" patch panels, and "Rotolector" rotary power switches, both developed by Herbert Kliegl.

4. Leviton - Wikipedia

   en.wikipedia.org/wiki/Leviton

   Leviton was founded in 1906 by Russian immigrants Evser Leviton and his son Isidor Leviton when they began manufacturing brass mantle tips for natural gas lights in Manhattan's Lower East Side. [ 2 ] [ 3 ] [ 4 ] In 1910, Isidor designed a screw-in lampholder for the newly invented electric light bulb and within ten years the lampholders were ...

5. Light switch - Wikipedia

   en.wikipedia.org/wiki/Light_switch

   Two light switches in one box. The switch on the right is a dimmer switch. The switch box is covered by a decorative plate. The first light switch employing "quick-break technology" was invented by John Henry Holmes in 1884 in the Shieldfield district of Newcastle upon Tyne. [1]

6. Dimmer - Wikipedia

   en.wikipedia.org/wiki/Dimmer

   When the dimmer is at 50% power, the switches are switching their highest voltage (>325 V in Europe) and the sudden surge of power causes the coils on the inductor to move, creating a buzzing sound associated with some types of dimmer; this same effect can be heard in the filaments of the incandescent lamps as "singing". The suppression ...

7. X10 (industry standard) - Wikipedia

   en.wikipedia.org/wiki/X10_(industry_standard)

   Many older appliance units have a 'local control' feature whereby the relay is intentionally bypassed with a high value resistor; the module can then sense the appliance's own switch and turn on the relay when the local switch is operated. This sense current may be incompatible with LED or CFL lamps. Not all devices can be used on a dimmer.