L.E.D.'s

[Martin Czech]

> I apologize if this is a redundant or "silly" question, but:
> 
> Does anyone know if there is such a thing as a L.E.D. which can produce
> four colours of light?
> 
> I know there are bi-colour types which can produce three.
> 
> Any info would be much appreciated.
>  
> John Greczula
> 
You don't need quad colour, three is enough, as you can see on your
tv-screen. There are three colour leds, which have three different
crystals in one package, and I think four pins. 
By proper setting up the currents, EVERY colour shoul be possible.
They are horribly expensive.

m.c.