The technological development and the low rate of effective improvement of the energetic efficiency in Brazil demonstrate the necessity of work in the area. The aim of this paper is to explore energy efficiency with emphasis in lighting, though an energy audit, which conducted a comprehensive analysis on two aspects, types lamps and the lighting quality. The work achieved a reduction in lighting consumption of 60%, totaling a saving value of R$ 91.747,93 over the life of the system. The investment was paid over a period of one year and two months, it is show a much higher profit than using the investment capital in another financial market application and its rate of return calculated at 7,66% per month and a Payback estimated return one year and eight months.