Tim,
I copied this from a post I made years ago on lighting:
Use as few lights as possible. I usually place two overhead and one just below counter top height.
To adjust intensity you have to render the presentation view with the light fixtures showing then right click on a light and adjust the intensity. You can also set the light intensity using the slider on the pop up dialog box and then right click on a fixture and choose Apply Dialog Settings.
less is more in lighting. Use the lowest intensity that you can to get th look you are after. Too much lighting washes away the textures.
You must also add shine to every texture in the room. Use the Light Intensity slider and Apply Dialog Settings from the right click menu to do this as you will only want a shine of 2 or 3 for walls and floors, 4 or 5 for everything else unless you want them to reflect. The shine is very important.
Be sure to use slightly different textures for your doors, face frames, moldings, and sheet stock.
This provides contrast and allows you to select different shine values for different items which help highlight them.
Place lighting where your light sources would actually be in the room. Work with the intensities to get natural looking shadows.
Don't use too much lighting. If your jpeg is too dark when you save it, use Irfanview to add a little brightness, contrast and most effective, Gamma Correction. This will give you perfect presentation shots.
Have fun with it.
HERE is a link to some of my jobs done this way.
Post your job so we can take a look at it to find the problem