Here's what I'm looking for:
    * A bi-colour two-lead LED which consists internally of two LED's in 
parallel facing in opposite directions
    * The forward voltage of both colours must be less than 2.5 V
    * 20 mA should be enough to have it very lit
    * Extremely bright because I'm multiplexing them in a 30 stage 
multiplexer and I want them to be visible in daylight

First thing I want to ask is:

Can someone suggest to me a minimal candela rating I should aim for? I 
know 1 candela is the light given off a candle, but I haven't got much 
of a clue how I should compare this to LED light.

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