Note, also, that if you often render similarly sized-and illuminated-scenes, you can greatly benefit by making the lights into light symbols. This way, once you have an initial scene set up the way you like it, you can retain each light's settings by converting it into a symbol and using it in subsequent projects. Under the right circumstances this technique can save you a great deal of set-up time, since you would already have a sense of the strength, reach and spread of any particular light.