Early dimmers were directly controlled through the manual manipulation of large dimmer panels. W. Dimmable CFLs have been marketed before suitable dimmers are available. A computerized lighting console controlling dimmers and lighting effects is not show control. House lights are often controlled by dimmers, but are sometimes on simple switches. The dimmers control the mains input to the transformers. Light dimmers for home use employ a specific type of PWM control. Modern professional dimmers are generally controlled by a digital control system like DMX or DALI. Non domestic dimmers are usually controlled remotely by means of various protocols. Each scene has the same number of channels which control the same dimmers. Theatrical dimmers tend to use a softer "S" or linear curve. Most modern dimmers are solid state, though many mechanical dimmers are still in operation. Solid-state or semiconductor dimmers were introduced to solve some of these problems. The dimmers are equally divided across the three incoming phases.