This paper aims to evaluate the technical and economic feasibility of the LED lamps used in traffic lights. LED's are one of the most promising options for the future of general lighting. With small dimension, useful life of 100,000 hours, high reliability, without emission of ultraviolet and infrared, have been used in numerous applications such as signaling systems in general. Using LED technology has been possible to verify the disappearance of the “ghosting effect”, when occurs the false impression of a light bulb being improperly connected, avoiding many accidents. The replacement of conventional incandescent lamps by LED technology has advantages as durability and energy saving. The case study presented two intersections in a large Brazilian city: intersection 1 (with incandescent technology) and intersection 2 (with LED technology). Measurements were made using a three-phase energy analyzer, installed at each measuring point during a week. Economic analyses were applied, demonstrating the fast return on investment for the LED technology. Measurements demonstrated that the power consumption of the LED lamp is 12 times smaller than the incandescent lamp and the replacement of technology is highly feasible.

Keyword:DLED traffic light, useful life, energy saving, return on investment.

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