Six puzzles of urban road lighting management (two)

Puzzle three: Changzhou city in 2007 has already begun to use LED lights, for example: Changzhou * * * road construction in 2007, has been almost completely damaged, replacement rate of 90% lamps; if we replace all over high pressure sodium lamp, the costs have been far greater than the market cost 40 times). Changzhou city ***2010 years of construction, there are serious color drift; damage rate 20%; Changzhou, 2013 * * * project construction, depreciation rate reached 15%, but the lamp damage or let us satisfied.

We often hear that LED's life is 50 thousand hours! High pressure sodium lamp life 2.5 times. However, LED lighting products in any part or parts of the defects will lead to the reduction of the overall performance of LED lamps. Through these practical engineering cases, let us think again, the whole lamp life and maintenance of the relationship, the maintenance cost is an important factor to consider the government funds to fund investment.

Confused four: we talked too much color, our 07 year LED is 6000K 13 years we used 4000K color temperature, color temperature, color temperature of 3000K in 14 years, we have used 3000K color temperature of our district and public green space. What color is the most appropriate? Do you want to see the road properties of the lamps?

Confused five: from the actual bidding results, in 2007 our LED bid is 40 yuan /W, 2014 is 15 yuan /W, but high pressure sodium per watt prices have been at a low level, the current price is still 2.5 times the price of sodium LED. According to the lamp life cycle of 50 thousand hours to calculate, LED street lamps and high pressure sodium lamp price equilibrium point where? What kind of price we can accept? In the whole life cycle: how much is the price equilibrium point of LED instead of sodium lamp?

Confused six: the light with LED speak too much, the lamp light distribution in the form of a variety of different technical parameters, quality, also speak a different lamp, but eventually we must satisfy the Ministry of housing for our street management unit is to meet the requirements of different grade roads to meet the "city road lighting design standards" (CJJ45-2006) assessment criteria. For a variety of light, tender, how to judge? Finally, we can achieve the desired effect in our practical application......