OT-ish: Blue LEDs

From: John Honniball <coredump_at_gifford.co.uk>
Date: Sun Oct 24 16:35:34 2004

Jules Richardson wrote:
> Does anyone know when blue LEDs first became commercially available?

I saw a blue LED waaay back in 1984, fitted to the disk controller
for a Newbrain. My friend got hold of one, somehow and fitted it
as a "power-on" LED in an early example of "case-modding"! He told
me that the blue LED was intended as a reference in spectroscopy.
It certainly formed a very narrow beam of light, instead of having
a diffuse "lens" as ordinary red LEDs do. It made a spot of light
on the opposite wall of the Uni halls-of-residence room when we
turned the lights out!

John Honniball
Received on Sun Oct 24 2004 - 16:35:34 BST

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