Backlight photography consist of doing what almost every digital camera manual will tell you not to do… Placing the light source behind the subject. Using such photography technique will trick the camera light sensor into believing that the light source is strong while in fact the subject being photographed has less light than it’s surrounding.
Fill light :The light that makes the "shadow side" of things visible, called fill light. In photography we define the fill light as one not creating any (as few as possible) visible shadows.
web resource:http://www.dpreview.com/news/0310/03102702foveonx3filllight.asp
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A hair light is usually a small lighting unit placed on a boom so it shines down from above and behind the subject. It is used to lighten the hair (or hat) and shoulders, add detail to the hair, and separate the subject from the background, presenting the illustration.
Key light: the key light is usually placed to one side of the subject's face, between 30 and 60 degrees off center and a bit higher than eye level. The key light is the brightest light in the lighting plan.
color temperature/describe: Color temperature is a characteristic of visible light that has important applications in lighting, photography, video-graphy, publishing, manufacturing, astrophysics, and other fields. The color temperature of a light source is the temperature of an ideal black-body radiator that radiates light of comparable hue to that light source.
http://www.betterphoto.com/article.asp?id=24
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