1 Gang 1 Way 250 Watt Dimmer, Classic White Dimmer (Sharp Edge) Trade pack of 5 Varilight V-Dim (Standard) Series Classic White Dimmer 1 Gang (Single), 1 Way 250 Watt Standard Dimmer Switch with White KnobVARILIGHT Dimmer Switches have an industry-wide reputation for exceptional performance, long life and innovation at attractive prices. Like all Varilight products these V-Dim (Standard) Series dimmers are designed to meet the latest European Safety Legislation. It is important to select the correct dimmer switch for your application so please read the following information carefully. Our V-Dim Series standard dimmers are Leading Edge and can be used with mains voltage lighting and good quality Low Voltage Electronic Transformers. When using Electronic Low Voltage transformers we recommend that a maximum of 5 good quality Dimmable Electronic Transformers are used (10 if Varilight) with this Dimmer range. Please note: add the watts of the bulbs/lamps if using Varilight Transformers, to determine which dimmer to select, but if using another manufacturer of Transformer, add up the VA of the Transformers so it does not exceed the maximum of the dimmer. Please note that noise levels can depend on the quality of the Transformer being used. The best suited dimmer series for dimming electronic Low Voltage transformers is the V-Pro Series, which has many features including Dimmer Buzz Elimination, that is created from the Transformers used. If using 6+ non Varilight Transformers then choose the V-Pro or V-Plus Series. The lights are turned on and off by a rotary on/off click action and dimmed by a rotary control knob. V-Dim Rotary on/off dimmers are only suitable for 1-way circuits. Please note, if total dimming is preferred from many switched locations, in a 2, 3 or more way circuit then choose the Varilight Touch and Remote range of dimmers, in conjunction with Slave Dimmers. V-Dim Rotary dimmers can be used for mains incandescent GLS lamps (standard mains light bulbs), up to the maximum load as specified on the dimmer. They can also dim GU10 or similar Hi Spot Mains Halogen lamps (only use quality UK supplied lamps) up to the maximum load as specified on dimmer. Choose V-Pro Dimmer Series if dimming LED's. The V-Dim Rotary Series are NOT suitable for use with wire wound Transformers or Fans and other inductive loads (for these products see The V-Plus [Intelligent IQ] Dimmer Series, and Fan Regulating dimmers). Please check with manufacturer of appliance to be dimmed. Choose V-Pro Dimmer Series if dimming LED's This Dimmer has a maximum of 250 Watts and minimum of 40 Watts Please see Varilight's recommendation of maximum loads in the Compatibility guide PDF found in "Specs & PDF's"-Height (mm):85-Width (mm):85-5021575400588-Max Load 250 Watt-Min Load 40 Watt-Fits in a 25mm Deep Wall Box-To clean product we recommend only using a microfibre cloth.