How to make outside brighter?

Is there anyway that I can make the env_light spread to places like under the overhang in my pic? I wanted to try and get it all lit with the natural light, I do not want to put in lights everywhere. In real life the dark places would be alot lighter.

http://img65.exs.cx/my.php?loc=img65&image=practicemap00007kb.jpg

Thank you for any help.

You're already using the light_environment entity...but there ARE two different light settings for it. I'm not totally sure this is right, but there are Brightness and Ambient settings. Turn up Ambient to, say, 100, and try that. Another thing that might be of interest is the -bounce parameter for vrad, but I think the default setting is good, actually.

Thank you, I was wondering about ambience what it did exactly, but that makes alot of sense, and it did indeed work.