Abstract: A method of operating an LED lamp coupled with a dimmer switch and includes receiving an input signal from the dimmer switch corresponding to a setting of the dimmer switch within its dimmable range, detecting a change of the setting within the upper portion of the dimmable range, which includes 80% to 100% of a maximum setting of the dimmer switch, and, responsive to detecting the change, adjusting drive current to at least one of a first or a LED light source to change a composite CCT produced by them within a first CCT range including about 3000 Kelvin to about 5000 Kelvin while substantially maintaining a composite brightness produced by the first and second LED light sources.

Abstract: An LED light fixture, in the form of lamps or luminaires, is comprised on a plurality of LED lights producing bright white or warm light and a plurality of color LED lights producing light of a visibly different color. The fixture includes control circuitry for receiving an input voltage signal from a dimmer switch wherein when the dimmer switch reduces the input voltage to the LED light fixture within a top range setting of the dimmer switch, the brightness of the light is maintained while the color Kelvin temperature of the light spectrum is reduced. If the dimmer switch is increased in the top range, the color temperature increases. This is achieved by increasing the frequency of a reduced input voltage signal during a reduction of the dimmer switch in the top range thereof to supply full driver current to the white or warm light LED's while reducing the driver current to the color LED's.

Abstract: A system and method for independently adjusting the correlated color temperature (CCT) and brightness of a light source having two or more color LED's or LED sets, with each color LED or LED set having a different correlated color temperature. A user person can selectively enable a selected one of the two or more color LED's or LED sets and adjust the brightness thereof and repeat the selection of the second color LED or LED set and adjust the brightness thereof. By independently selecting the color LED or LED set and modifying the brightness thereof, a desired light atmosphere can be created by adjusting the output color mixture of the LED's or LED sets and controlling the brightness of the combination of the color LED's or LED sets. The selection of individual color LED's and the brightness adjustment thereof can be made by a mechanical operable control device or by remote wireless control device.