When compared with traditional lightings, LED lightning enjoys several advantages, including higher energy efficiency, less maintenance needs, reduced environmental impact (no mercury) and significantly longer life expectancy up to 50,000 hours. The outstanding system efficacy of LED lighting as high as 90.7%, calculated by the mathematical multiplication of light source efficacy, power efficiency and luminaire efficiency, can be revealed when it is side-by-side compared with those of traditional lightings in the following table.
An important lighting parameter that users of LED general illumination should be aware of is “color rendering index” (CRI). Ranging between 0 and 100, CRI characterizes the ability of a light source to make colors look true and natural. The closer a light source gets to 100 on CRI, the more natural colors are rendered. LEDs with CRI below 75 are not recommended for indoor lighting. At the present time, LEDs with CRI higher than 92 is available in the market.