What’s the difference between leading edge, trailing edge, 0-10, Triac, etc.?

- Feb 21, 2019-

Leading edge (also known as Forward Phase) dimming refers to the low cost triac type dimmers that phase cut the leading edge of the AC sinewave.
Trailing edge (also known as Reverse Phase) dimming refers to the higher end Mosfet based dimmers, which phase cut the trailing edge of the sinewave.

0-10V dimming is a low voltage, secondary side control method, where a DC voltage level is applied to a driver (or dimmer module) to control the output level, either through PWM or DC voltage/current. This 0-10V signal can come from a commercial low voltage dimmer, such as a Lutron dimmer control, or from an adjustable DC supply, which can be adjusted from 0-10V DC, or even a computer controlled system, which uses a A/D converter output that generates the 0-10V signal level.