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In some cases, materials in the rendering may look much lighter or much darker than you expect, even though they look fine in the material library. One common reaction to this is to turn up the brightness of all the lights in the model. This strategy is not effective due to AccuRender 3's automatic exposure adjustment. Identifying the real cause of the problem is the first step in solving it.
One of the most common causes of materials looking too light or too dark is that AccuRender has over or underexposed the image. When overexposed, the image will look very white and burned out. This happens most often on images in which all the objects in the model are very reflective. If this is the case set the exposure brightness to a lower value (Raytrace tab, Adjust Exposure. As a starting point, set Brightness to -0.5). If all the materials are very dark and gray, try setting the Brightness to 0.375. If these settings improve the image, experiment with the Brightness setting until you get what you want.
If you looking outside from an interior, the exterior objects look very light. This is because the light outside is many times brighter than the light inside. This is very similar to the problems that you have with a camera when taking a similar shot. There is a discussion on page 99 of the AccuRender 3 manual on techniques to deal with this problem.