OT-ish: Blue LEDs

[Brad Parker]

Jules Richardson wrote:
>
>Does anyone know when blue LEDs first became commercially available? The
>pair of Apollos that arrived at the museum yesterday both have
>rectangular blue LEDs fitted alongside the amber and green on the front
>of the machine - the systems date from 1990 though...

I tried to put them into a system around 1989-90 and found they were
*very* expensive.  The person in charge of purchasing came back with
something like hundreds of dollers per led...

-brad