/CubeLight.java/1.3/Fri Jan 26 00:24:57 2007//
/LightBulb.java/1.13/Sun Jan 14 06:23:48 2007//
/MercuryXenonLamp.java/1.13/Thu Oct  5 23:16:34 2006//
/PlanarLight.java/1.11/Mon Dec 18 08:42:23 2006//
D
