Or even if you still wanted to hire them you would now come off knowing a whole lot more than all of their other clients and would be treated with just that much more respect. It's the same reason you likely pay your mechanic or even your doctor, you pay them because they know things about your decor, car or body you don't.

Space your lighting sources out to about every ten feet or so. It just makes sense, you're good at what you do and they are good at what they do, simple really. Then start searching for dead shadow spots. But what if some of the secrets of the pro's like those of your interior designer were leaked out to you. If you notice the table lamps lighting designs of the pro's one of the things that becomes rather obvious. Then you could very easily do some of the design work yourself and save a bundle in the process. Why do you pay an interior designer.

Dead spots are areas where your lighting coverage does not quite adequately cover and causes shadowy areas.