The source of light in this picture is the light on the desk next to her. It's a cool light, which is odd because there is probably an incandescent lamp in the fixture.
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The setting sun is the source in this picture. It has a cooler feel to it, creating the feeling of sunset opposed to sunrise.
The lone flourescent light is the source in this picture. It is a cool light that fills the room softly.
The source in this picture is directly between the two figures in it. They block the light from illuminating the surroundings keeping the light dim and the focus tight.
The raver's lightsticks are the source in this picture, although they are unclear because of the photographic effect. The lightsticks are chemical lights, which make them different than the other 4 on this page.
