Dimmer: English called dimmer. The purpose of the dimmer is to adjust the brightness of the light. Different intensity of light output produced by the average power of light by reducing or increasing RMS voltage. Although variable voltage devices can be used for a variety of purposes, this regulation is designed to control lighting.
The range of dimmers is: small units of the size of normal light switches used for home lighting, high-power units used in large theaters or architectural lighting. Small unit dimmers are usually controlled directly, while high power units use remote control systems. Modern professional dimmers generally use digital control systems like DMX or Ethernet.
Changes in the intensity of the professional lighting industry are called "disappearing" and can "disappear" or "disappear." Dimmers, directly controlled by a number of manual limits, their speeds can be different, but in this issue has been basically eliminated in modern digital troops (although very fast brightness changes may still be avoided for other reasons affecting light bulbs life).
Modern dimmers are built by thyristors (1373) instead of potentiometers or variable resistors because they have higher efficiency. The variable resistor will dissipate heat (inefficient 0.5). By switching and switching off, the silicon-controlled rectifier is theoretically not hot (the efficiency is close to 1.0).