The rotary dimmer can be used with most types of dimmable LEDs and all incandescent lamps. Due to different technology used in different brands of LEDs, Major Tech can only guarantee compatibility with all of Major Techs dimmable LEDs and all brands of incandescent lamps. The dimmer includes a pilot light to easily find it in the dark. Dimming is controlled by rotating the dimmer knob in a clockwise direction to increase light intensity and in an anticlockwise direction to decrease the light intensity. The dimmer is turned on and off by rotating the knob until a distinct clicking noise is heard at the start of the dimming cycle. The dimmer uses trailing edge technology to limit the stress put on the lamps.