>when both colours are on,  the actual viewed colour depends
>on the angle somewhat but they were the best around at the time

I have found this to be the case with all bi-colour LED's I have dealt with,
even when the lens is frosted it still occurs to some degree.

I was going to suggest Kingbright, some product lines from them are
available through RS, but looking round their website doesn't categorise
things the way one would hope. http://www.kingbright-led.com/Default.asp

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