Old streetlights made with ionized sodium as material require high-wattage lamps, high power consumption and suffer serious luminance decay, apt to dim after long-time use. Along with rapid tech development, LED has been gradually applied to streetlights and diverse industries for illumination, replacing traditional lighting materials while boasting lower power consumption and better lighting performance. But a large variety of LED lights now available in the market differ greatly in quality levels, often requiring manual replacement when they break down or burn out, with special tools also needed to handle replacement of large-sized LED fixtures. Accordingly, it may not pay to buy ordinary LED lights at cheaper prices, given their invisible maintenance cost increase.