Welcome to the easiest way to get color tuning and dimming in fixtures. How does Energy Focus do it? With the EnFocus system where you simply change the switch to either the dimming-only or dimming & color tuning. Both available in 2-wire or 3-wire configuration (best to find out which your application needs prior to ordering). No complicated re-wiring process or adding of dimmers. These lamps will dim on 100-277V with their patented flicker free technology. Color-tunable is also controlled by the switch and has 10 color temperatures between 2700K and 6500K. High efficacy of 150 lumens/watt.