A tunable illumination system is disclosed which splits a single channel output into three by means of current steering and/or time division and multiplexing techniques. More particularly, the tunable light system may split the input current into three pulse-width modulated (PWM) channels. The individual duty cycles of the PWM channels may be adjusted based on a control signal that is received via a control signal interface. The control signal interface may include a switch and/or other circuitry that is manipulated by the user when the user wants to change the color of light that is output by the illumination system.