Christmas Brain Teaser

- now I know they make Light Emitting Diodes that produce Red light / and I know they produce Light Emitting Diodes that produce Green Light / and I know that they produce Light Emitting Diodes that produce Blue light / so with these three primary colors you could produce EVERY COLOR - 

- and so some manufacturer must produce a Christmas bulb that contains these three different colored LEDs which results in a Christmas light that can change colors - I would like to buy a string of these things- my problem is that I always have trouble with internet searchs ( like finding the magical keywords etc )

- well when I search the internet I always find strings that just contain the old fashioned ALL THE COLORS

but don't contain bulbs which can individually change colors ( which is what I want ) 

--- so my question and my problem is I want to know and I want to find out - what the Technical / Trade name would be for a bulb or a string of bulbs in which the individual bulbs are capable of changing colors ( seems no matter the combination or variation of the words I find strings of bulbs which just contain different colored lights )

-  so is there a modern correct technical term or trade name for a bulb which contains the three leds and can change colors ?

-- like I just think there has to be but I don't know it - because I would guess that if a CEO told a purchasing Agent to buy as many of these bulbs as he could for a small fortune and the manufacturer sent him the old fashioned multicolored bulbs instead of bulbs which could change color - well someone would be upset - so there has to be some way the industry could specific which kind of bulbs one wants ?

- so what would be the industry trade term for individual christmas lights which can change into all the different colors ? Would you know the name and be able to help by telling me?