> What LED current / power are you using?

5mm white, 5V, 100R series

2mm green, 5V, 270R each (worked better than I expected)

> What is the display area?

Whole glass is 50x25. Cutout area in pictures, 44x18
 
> I'm interested in the possibility of extending that to a somewhat
> larger display.
> If you used a single LED on a larger display, does it seem that you
> would get a similar illumination? 

It helps if you can get the LED further back. I'm very limited in that
regard and have to tone down the bright area right in front of the
LED. Have only one type of white and that has a fairly narrow beam.
Coloured LEDs I have in all varieties I have but a small selection
only of ones with decent output. Red is the only colour that doesn't
really look too good. A bicolour red-green would be useful if SB or
UB were available. Green for normal, red for alarm or whatever,
but you could do it with singles

> but the effect may be acceptable). How much more area seems
> likely with a single LED?

As above, really good if you've room

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