A 3D model can be lit by up to 3 individual light sources. The lighting toolbox lets you adjust the direction, color and intensity of each of those lights.
1 2 3 Select the light you'd like to change.
4 The sphere shows you where each light is positioned in space and gives you a preview of your current lighting setup. Drag here to change the direction/position of the selected light.
5 Drag the slider to adjust the intensity of the selected light. By clicking the button on the left, the light can be switched on and off.
6 Drag the white square horizontally to adjust the saturation, and vertically to change the brightness of the light's color.
7 This slider changes the hue of the current light.