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Creative Commons Attribution 4.0 International License
This work is licensed under a Creative Commons Attribution 4.0 International License.


Energy efficiency can be an interesting field for alternative investments. The main question is: Are these investments worthwhile? This article presents a new approach to evaluate the risks and achievable returns of energy efficiency investments via the example of lighting devices: To the author’s knowledge, cost equivalents have not been used to compare alternative solutions in the field of energy efficiency investments. The selection of optimal technology always depends on the intensity of use and on the expected rate of return. The primacy of compact fluorescent tubes is indisputable from a financial perspective. With the LED and Compact fluorescent lamps compared to incandescent light bulbs, depending on the daily use, an annual average 24-74% cost saving can be achieved. In case of spot lighting, LED light sources have been better than those observed in the case of illumination of a particular area, and in almost each tested case they held second place with only a minor lag in comparison with the compact fluorescent tubes.