Quote:
Originally Posted by MrB
Now that I'm at work I have time to look things up 
The deep red LED at Jaycar is cat# ZD-0152.
It's wavelength is 660nm (very close to Hydrogen alpha  ) where most red LED's are around 620 - 630nm and look kinda orange by comparison.
Cheap at only 65c each. |
Or get 5 for $1.25 total @ 660nm, 650mcd brightness, proper datasheet available to show Vf/If curve, and free next day delivery Australia wide, decent brand.
http://au.rs-online.com/web/p/visible-leds/2285067/
Dont have to drive to Jaycar, battle traffic, big line of people, rude people, etc.