Wade wrote:

> How do I add more lights to brighten up the left wall?  

You can have more than one light source in a scene. Or you can specify 
  color White*1.5
to make your exsiting one brighter.

> And how do I get a
> lighter shade of the khaki that I'm using.  Here's my code:

Again, you can multiply the color by a constant, e.g.
  color Khaki*1.5 
or also do calculations with it:
  color 1-(1-Kahki)*0.5
which will reduce the difference between Khaki and White. You could also 
play with the ambient and diffuse values, which will actually not change 
the color but the way how the surface reacts on the incoming light.

 - Micha

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