ambient light only -- note the general lack of realism
single key light -- note the harsh shadows
key light from above with added fill light
front lights from 45 degree angle -- result is fairly flat
front lights directly in front -- result is still fairly flat
backlights
side lights
top lights
uncolored light illumination
complementary colored light illumination
directional light -- can be used for sunlight
spot light -- can be used for headlights
spotlight with high dropoff and soft penumbra
spotlight with barn doors and hard penumbra
point light with no decay
point light with linear decay
spotlight with color attributes approximated by a gobo