A video over on Gizmodo talks about the emotional cast that orange and blues have on film. It’s a great beginning primer on the physics of light and color.
If you are new to the study of perception in Psychology and you’re a web designer, take a look at this video to learn how the different light frequencies happen. You can transfer some of these concepts to color choice in your web design, perhaps even do a bit of math in the Kelvin ranges to come up with colors not only in an aesthetic way but a quantitative way as well.