On 3/11/08, David VanHorn <microbrix@gmail.com> wrote:
> On Tue, Mar 11, 2008 at 11:35 AM, Vasile Surducan <piclist9@gmail.com> wrote:
> > Coherent light is defined by energy at a known wavelenght, while non
> > coherent by a sum of energies at different wavelenght.
>
>
> You're confusing coherency with monochromaticity.  Coherency is different.
> http://library.thinkquest.org/27356/d_coherentlight.htm

yap, I was thinking to the monochrome light indeed... :(

>
>
> > A LED has wavelenght disperssion of about 10-20nm , while a good laser
> > diode below 1nm in the worst situation. About the laser spot, that
> > depends on distance between the laser sourse and the target point.
>
> For this app, broad-fan illumination, say 100-ish degrees by 50-ish
> would be good.
>
> > Only you know what do you want...
>
> :)  Most picture per milliwatt of illumination.
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