Reflection in direct or even indirect sunlight can make even the brightes=
t=20
LED's impossible to read.  Look into some type of low-glare filter.

Cheers,
-Neil.



On Monday 28 April 2003 11:41, David Strickland wrote:
> I'm working on a clock design using some LEDs, and have no real idea
> what range of mcd (milli-candela) I need to use for it to be visible
> during the day.
>
> The 7-segment and matrix setups I looked at so far ranged from 4.8 mcd
> for a green 5x7 matrix, to 8 for a green 7segment, to 20 for a red 7
> segment.  Are these remotely bright enough to see across a sunlit room?
>
>
> David

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