How to produce cold hardiness LED lights

　　Most of our cold regions at high latitudes , cold climate, large temperature difference , and therefore the application of LED lighting products has brought new challenges. On the other hand , most of the cold regions of the average daily lighting time is longer than the national average , so the lighting power consumption is also higher than the national average , so the shorter days and longer geographical features brought more demand for LED lighting applications . Overall , LED lighting product applications have both challenges and opportunities. LED lights in the cold regions of the application, the following aspects need to be addressed key technical issues.

　　1, the thermal shock temperature changes may cause the failure of LED devices

　　An LED street light LED devices up to hundreds of pieces , usually in series hybrid configuration based way, if one LED fails, will cause multiple LED joint failure , the application of LED in cold regions lights first according to a specific context luminaires temperature characteristics , set a reasonable ultrasonic power, bonding pressure , bonding time and bonding temperature encapsulation process parameters, to ensure that every one LED device reliability under low temperature operating environment .

　　2, LED driving device cool-running reliability guarantee

　　First , the switch at low carrier density and downloading activity will be reduced , overload starting point will therefore lower ; Second , the electrolyte electrolytic capacitors freeze at low temperatures , loss of capacitance effects ( ions in solution at this time there is only ionic polarization ) , no load capacity ; Third, some types of optical coupling device at low temperature does not work ; fourth , the input to prevent inrush current thermistor resistance at low temperatures becomes larger ( room temperature is 3 to 5 times ) , can also cause hypothermia not start properly.

　　3, LED lights ice condensation hazard protection measures

　　Promote the use of lights in the cold regions is very easy to ignore a problem is because of snow and ice accumulation on the surface of the light , after the formation of heat to melt ice, ice , once formed, for vehicles and pedestrians will have a very big security risk. Especially the LED lights, commonly used as lamp housing aluminum, alumina surface is hydrophilic material , more prone to ice condensation . 2008 , large-scale snowstorm in southern China , resulting in a large number of high-voltage wiring aluminum surface ice condensation , collapsed a lot of damage to power facilities . This is not only the consequences of climate disasters caused by high voltage cables belonging to the alumina surface hydrophilic material is also an important incentive. Since affect road traffic safety , thus preventing ice condensation is the LED lights in the cold regions must take into account the security measures.