| The solid-state lighting is quickly becoming more efficient and accessible. LEDs are starting to be used for illumination purposes rather than just decoration. One of many LED advantages is color mixing. Light provided by monochromatic LEDs can be combined with that of other LEDs in order to achieve additional colors. However, little has been done with white LEDs in this regard.;This project suggests a technique to combine two different colors of white LED light and obtain a specific color temperature selected by the user. The prototype of a LED-lamp with color mixing characteristics was designed, constructed and tested. This system is composed of two LED luminaires and an electronic controller. It will provide white light in a range between 3700 and 6800K.;Moreover, this system is also capable of adjusting itself when external lighting conditions exist. The device includes a Color Light-To-Frequency converter capable of decomposing the light it its red, green and blue components. In a combination of light generated by the lamp's LEDs and the light in the environment, the controller is able to identify which portions correspond to each source and therefore its able compensate the amount of light generated by the LEDs in order to create a light mixture with the color temperature characteristics selected by the user.;This will ensure that the color temperature of the light provided by the lamp will remain the same regardless of the mixing effect of other sources of light in the room. |
