> Hosfelt electronics (http://www.hosfelt.com/) used to
> sell multi-color LED's (8 colors in total) which
> contained a red, green, and two blue chips all in a
> single package

Aren't these simply RGB (ie full spectrum) LEDs ? Try
Kingbrite, Hewlett Packard et al. Google brings up an
absolute shirtload of pages for "RGB LED"

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