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For example,James 100W LED street lamp, for example, a year ago purchase cost of LED street lamp for 2500 - 3000 yuan, at present street price dropped to 1500 yuan - 1800 yuan, the return period of 800 - 1200 yuan high pressure sodium lamp replacement reduced to 2 - 3 years. The LED street lamp energy saving 9, life expectancy of 50% years, the lamp is not required to replace the lamp. New lamps using led the price has been very clear science and Technology Department of Guangdong Province, according to data from the past two years led demonstration project, economic and energy saving effect of the LED street light renovation project calculates the calculated in accordance with the 200 million LED lights, the transformation of the former, every street lamp electricity charges reached 20 billion yuan, annual lamp replacement fee of up to 5 billion yuan, this year the total cost reached 25 billion yuan.

After the transformation, the annual saving the total cost of 15 billion yuan, including saving 50% of the electricity and 5 billion yuan of lamp replacement costs a total investment of 200 million LED lights transform for 48.9 billion yuan, the total cost of the loan interest rate plus a total of 61 million yuan. In the LED street lamp 9 years of life, a total saving 135 billion yuan, local finance obtained the proceeds of energy-saving is 74 billion yuan in electricity savings of 108 million kilowatts when, equivalent to 379 million tons of standard coal saving, reduce 7 million tons of sulfur dioxide emissions, reduce carbon dioxide emissions of 268 million tons, reducing soot emissions 7 million tons, "thus, from the imposition of tariffs with urban public utilities additional income according to the proportion of extraction energy efficiency, can pay led the transformation of the investment, and can produce obvious economic benefit and energy saving and emission reduction." Thomas Song, director of science and Technology Department of Guangdong province.