The higher upfront costs of LED lamps may be offset by reduced electricity and maintenance costs over the long life of the LED lamps, eventually providing long-term savings. This report explores the life-cycle cost (LCC) and payback for linear (T8) LED lamps used as retrofit products in existing fluorescent troffers, which is likely the most frequent use scenario. The analysis considers multiple equipment costs, melded electricity rates, annual operating hours, and installation costs; although these cannot cover every application, they provide a framework where the financial benefit can be estimated for a wide variety of installations.