need some lighting in this scene but not working!

can someone ahve a look at the light set up
and how we can see teh color for object in render ?

i know that the object size are very large
so i increase light intensity to 1000 ?
but still cannot get the color in render ?

any advice welcome
see file

and why is this file so big with so little objects inside ?
is there a way to compress this like in 2.49?

working but ?
if i change from shadow buffer to raytrace and set spot at about 300 energie
i begin to see the color nicely but not working in shadow buffer why ?