The evolution from tungsten lighting to LED technology has led to experiments in which design is involved. New technological devices capture the energy produced by the light emitted by the luminaire and return it to the luminaire. In contrast, others exploit its high-frequency modulation and make it possible to "fill" a beam of LED light with information. This technology is called Light-Fidelity. The data is captured through an optical instrument and remains confined within the range of the light beam. In this case, the emitting device itself has a dual function: making light and transmitting data.