About Cree, Inc Cree is a market-leading innovator of lighting- class LEDs, lighting products and semiconductor products for power and radio frequency (RF) applications. Cree believes in unlocking the power and potential of technology, enabling the world to do more with less and transforming the way people experience light through highquality interior and exterior LED lighting solutions. Cree's areas of business include LED lighting systems and bulbs, blue and green LED chips, high-brightness LEDs, lighting-class power LEDs, and power-switching and RF devices from Wolfspeed. Cree products are driving improvements in applications such as indoor and outdoor general illumination, intelligent lighting, electronic signs, video displays and signals, EV/HEVs, renewable energy, radar and satellite communications. Reflector used in led street light Most LED street lights have a lens (lentille) on the LED panel, which is designed to cast its light in a rectangular pattern, an advantage compared to traditional street lights, which typically have a reflector on the back side of a high-pressure sodium lamp. In this case, much of the luminance of the light is lost and produces light pollution in the air and surrounding environment. Such street lights can also cause glare for drivers and pedestrians. Energy efficiency The primary appeal of LED street lighting is energy efficiency compared to conventional street lighting fixture technologies such as high pressure sodium (HPS) and metal halide (MH). Research continues to improve the efficiency of newer models of LED street lights. An LED street light based on a 901-milliwatt output LED can normally produce the same amount of (or higher) luminance as a traditional light, but requires only half of the power consumption. LED lighting does not typically fail, but instead decreases in output until it needs to be replaced. It is estimated that installation of energy efficient street lighting in the 10 largest metropolitan areas in the U.S. could reduce annual carbon dioxide emissions by 1.2 million metric tons, the equivalent of taking 212,000 vehicles off the road, and save at least $90 million annually in electricity costs. As LED lighting fixtures normally produce less illumination (eclairage), it is important to use a well-distributed illumination pattern in order to produce the same illumination as higher-lumen conventional fixtures. For example, different LEDs in one fixture can target different points on the street.
