Indirect control of luminous flux and chromatic shift methodology applied to RGB LEDs

This paper presents a method of control for RGB LED systems, modelling and equating of a system of LEDs are shown in details in order to obtain constant output luminous flux information for each color, reducing the color shift with the temperature variation. Also the paper discusses the control strategy employed and the methodology employed to eliminate the temperature influence on the color shift. Some simulation results are shown in order to prove the methodology, followed by some practical results.