Light End Posted on 5th December 201527th May 2021 by ThePD (The Project Definition) Light End is the petroleum refining products that condenses at the top of the distillation tower, such as propane, butane. Related Definitions in the Project: The Plant and Process Unit Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window) Related Posted in Substance and tagged plant, product, refinery, substance. ThePD (The Project Definition) ThePD has been developing the Preferred Project Definitions based on the actual project execution and operation experiences and knowledge with the Project Language, and sharing with you daily basis.