There are two different methods for producing white light with LEDs. The first of these is the RGB method and the other is the phosphor method. The most commonly used option in the lighting industry is the phosphor method.
In the RGB method, white light is obtained simply by mixing the red, green and blue colored lights in the appropriate ratio.
In the phosphor method, a blue LED chip is coated with a yellow phosphor to produce an LED package that emits white light. The blue light produced by the LED chip passes through the yellow phosphor layer, resulting in white light with the combination of blue and yellow photons.
The phosphor method used to obtain white light is more efficient than the RGB method. Also, the color rendering performance is higher.
