SoVRMLDirectionalLight(3) on Linux
The text dba387d72f2f, as Debian 8 (Jessie) shipped it.
The SoVRMLDirectionalLight class is a node type for specifying directional light sources The detailed class documentation is taken verbatim from the VRML97 standard (ISO/IEC 14772-1:1997). It is copyright The Web3D Consortium, and is used by permission of the Consortium: