There are several things I'd look at:
1. Don't use count. IMHO its more intuitive to use spacing,
 as decreased values lead to predictable better results.Also,
your count seems way too low, I always get several
hundreds of thousand, sometimes millions of photons for
decent results, and it should be higher cause you're even spreading
some across the media.
2. Set max_trace_level for the photons higher, they might
be too low (I think 5 is default)
3. Global-Media doesn't work very nice AFAIK, its better
to use containment. Since its all happening in a box, why don't
you use a box?

I'll download your scene-file and see what I can do.

Regards,
Tim

--
Tim Nikias
Homepage: http://www.digitaltwilight.de/no_lights/index.html
Email: Tim### [at] gmxde

>
> and ofcourse, my media settings :
>
> // --- media ---
> media {
>   scattering { 1 rgb .3 extinction .1 }
>   samples 1000
> }
>
> full scene source will be posted in a minute
>
> --
> #macro g(U,V)(.4*abs(sin(9*sqrt(pow(x-U,2)+pow(y-V,2))))*pow(1-min(1,(sqrt(
> pow(x-U,2)+pow(y-V,2))*.3)),2)+.9)#end#macro p(c)#if(c>1)#local l=mod(c,100
> );g(2*div(l,10)-8,2*mod(l,10)-8)*p(div(c,100))#else 1#end#end light_source{
> y 2}sphere{z*20 9pigment{function{p(26252423)*p(36455644)*p(66656463)}}}//M

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