Day Light only - but not direct sunlight - south facing room - sunny day - near a window.   You have to be careful if you are using daylight to light up your set. Firstly do not use direct sunlight i.e. a shaft of sunlight coming in the window. Because it will rarely be constant, moving across the sky will change its intensity and shadows from clouds etc. will result in varying light on your set. This will result in a disastrous effect when you play your frames back. It will really lose the illusion you are trying to create. If you do use daylight then be really careful !
Notice the slight orange effect in the set..but no shadows as the light is diffuse..ie. light bouncing around. When you have a shadow because a direct light source is shining on your subject then it is called hard light! Normally you will want to avoid this.	Day Light only - but not direct sunlight - blinds closed - near a window - daytime ambient light only. You can get away with this setup as long as you watch out again for variations in light during the day. Don't get caught out with gradual dimming of light intensity as the day heads in to evening and then having to turn on a lamp..eek..then your whole scene lighting will change in the middle of your story!
In this setup you can see two obvious things. 1-There is a hard shadow caused by the single lamp used. 2-The set is orange-ish because of the light reflecting off the wall (transfer of colour from the wall) and also bulbs do actually give off an orange hue. Our eyes compensate for this and we do not normally notice it. But when photographed with digital equipment such as a webcam the orange hue comes out.	Blinds closed - ambient daylight only - Lights on in room centre light and lamp on directed toward scene. Probably the best solution using lamps. And I'd say lamps even though there is only one lamp used in the scene shown here. You can avoid the shadow shown here by using a second lamp on the left hand side if you wish.

Ideally you should have no daylight entering the room so that means animating at night so that there will be no change in ambient light in the room coming from outside.

If you want to animate during the day then make sure you block out as much daylight as you can and use lamps as your light source.

Also don't put the lamps behind you as you will cast a shadow over you set.

One more thing and this comes down to the quality of your webcam or digital camera, you should be able to adjust the contrast brightness and white balance via some kind of control on your camera or computer. Shown below is a very good set of controls for a webcam (Logitech Webcam Deluxe for notebooks) Make sure you have "White Balance" set to manual and play with the setting until you get a good picture.

A Final Note :

Do not use Fluorescent lighting

Fluorescent bulbs are not used for lighting film and video until recently. This was because of problems with flicker and a tendency to emit more of a greenish hue. It is most likely that you will have the older / cheaper type of fluorescent lighting not used / designed for use in movies. The Fluorescent lights used in film now are made to be flicker-free and come in both daylight and tungsten balanced bulbs. "Kino-flo" is one of the major companies involved in making fluorescent bulbs and fixtures for film and video production. Fluorescent lights tend to be very soft, but do not put out much light in comparison to other lighting instruments.