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research was done on several manufacturers catalogs and lighting tests, hoping to reach satisfactory levels of economy and quality in public illumination. The LED technology luminaries have been used in a few countries and they have very good prospects of being implemented in other countries as well. In order for this implementation to be real, a lot of factors must be analyzed. They will be addressed in this study. The possible substitution of the 70Watts sodium steam bulb for a LED luminary would be feasible only if it is guaranteed, through tests, that the LED luminaries are more efficient, have a higher bright flow when compared with the usual steam bulb and if they fit the brazilian technical standards. Keywords – Public Illumination, luminotecnics tests, comparative studies between lighs, energy efficiency, new tecnology . NOMENCLATURA Lm Cd Lm/W LED HB-LED VS70W Grandeza do Fluxo luminoso, (lúmen). Grandeza de Intensidade Luminosa, (candela). Eficiência Luminosa. Light Emission Diode. High Brightness LED. Vapor de Sódio 70Watts. I. INTRODUÇÃO Palavras-Chave – Iluminação pública, testes luminotécnicos, estudos comparativos entre luminárias, eficiência energética, novas tecnologias. O LED (do inglês Light Emission Diode, diodo emissor de luz) é um dispositivo eletrônico semicondutor, que quando polarizado diretamente, dentro do semicondutor ocorre a recombinação de lacunas e elétrons. Essa recombinação exige que a energia armazenada por esses elétrons sejam…