[BC] Clock display color

[Mike McCarthy]

> On Feb 17, 2012, at 4:25 PM, Mike McCarthy <towers at mre.com> wrote:
>> If you were installing new single color digital studio clocks, which
>> color: Red or Green?
>
> Ours are red and the staff likes them a lot for ease of visibility. We
> initially looked for blue or green but we couldn't find any that wouldn't
> be a custom build.

I was told blue is hard to focus upon since the light refracts off the
retina.  If you have an astigmatism, it's really hard to read.

The green wavelength is critical and it takes much more energy as a reault
to provide a similar light output. Red is far more efficient as a result
of it's shorter lambda.

MM