Computation times

00:07.612 total execution time for 7 files from examples/04-lights:

Example	Time	Mem (MB)
Plotter Lighting Systems (plotter_lighting.py)	00:02.527	0.0
Shadows (shadows.py)	00:01.043	0.0
Light Types (light_types.py)	00:01.012	0.0
Beam Shape (beam_shape.py)	00:00.901	0.0
Light Actors (light_actors.py)	00:00.807	0.0
Attenuation (attenuation.py)	00:00.703	0.0
Disabling Mesh Lighting (mesh_lighting.py)	00:00.618	0.0