Tag Archives: power LED light

How to solve the cooling problems of LED chip of high-power white LED lights

With a wide range of high-power white LED applications including the COB LED flood light, the cooling problems of LED chip of high-power white LED lights such as COB LED flood light is urgently to solve in the actual life, high heat of LED chip is generated in a very small volume,but the heat capacity of the LED itself of COB LED flood light and other power LED lighting is small, these heat must be conducted as soon as possible otherwise it will have a very high junction temperature. We have been a lot of improvements on the chip of COB LED flood light and other power public LED lighting to leads the heat outside of the chip, the main improvement is the use of better thermal conductivity substrate material on the LED chip structure to improve the heat dissipation of the LED chip of power LED lights particularly the COB LED flood light and other power commercial and industrial LED lighting . because Cree ‘s LED thermal resistance use silicon carbide as the substrate , the thermal resistance is at least twice as low as that of other companies .

COB LED flood light

Even if thermal resistance can be solved from the chip to the package material, but the cooling effect is not good from the package to the PCB board, which cause that the temperature of LED chip of COB LED flood light and other power LED light rises, the phenomenon appears luminous efficiency decreases . So, just as the Panasonic want to solve this problem , the circular , linear, surface -type white LED, and PCB board have been designed into one since 2005 to overcome the heat problem because of the interruption emergence from the package to the PCB board .

Thus , in the face of constantly improving the current situation , while how to increase the heat capacity of the chip of COB LED flood light and other power LED lights is urgent to be overcome at this stage, in addition to the material itself, but also including the wafer and the heat resistance of the packaging material , heat resistance thermal structure, thermal structure between the packaging materials and the PCB board and the thermal structure of PCB , all of which of COB LED flood light and other power LED lights needs to be holistic considerations.Browsing http://www.lead-lighting.com/products/bid19-1.htm for more information about the COB LED flood light.

Article from http://www.lighting-ledlight.com/index.php/how-to-solve-the-cooling-problems-of-led-chip-of-high-power-white-led-lights-such-as-cob-led-flood-light/

What are the factors limiting the application of power LED lighting

How to effectively dissipate the heat is increasingly paid attention to by the those developing and researching LED lighting products particularly power LED lights including outdoor LED flood light and other commercial and industrial LED lights , because the light failure or life of outdoor LED flood light and other LED lights is directly related to the junction temperature ,poor heat dissipation is that the junction temperature of LED is high , so the life is short .

outdoor LED flood light

Today power LED lighting products such as outdoor LED flood light are increasingly used in various fields and put into use , we are worried about practical issues while amazing the pleasure power outdoor LED flood light and other power LED lights bring !

First of all, as far as the characters of high-power white LED light especially outdoor LED flood light are concerned, the high-power outdoor LED flood light and other commercial and industrial LED lights LED still exists that the luminous uniformity is poor , the life is not long because of enclosed materials particularly cooling problem of the chip of outdoor LED flood light and other commercial and industrial LED lights is difficult to get a good solution , but can not play the advantages of outdoor LED flood light and other white LED applications which are expected.

Secondly, considering the price of outdoor LED flood light and other high-power white LED lighting,because of the high power, high brightness, the cost of manufacturing materials such as LED chip and heat sink and power supply is much dearer than that of the average household indoor low-power LED lights. Today’s high-power LED lights including the outdoor LED flood light is mainly used for public lighting or commercial and industrial purpose,because the price is still too high and the technically still needs to be improved , which significantly limits the high-power outdoor LED flood light and other power LED lighting product.Browsing http://www.lead-lighting.com/products/sid53-1.htm for the better understanding of outdoor LED flood light.

Article from http://www.lighting-ledlight.com/index.php/what-are-the-factors-limiting-the-application-of-power-led-lighting-including-outdoor-led-flood-light/

How do the junction temperature of LED light generate

Why the LED light especially the high power LED lights including the high power LED flood light generating the heat is because that all of the electricity inputted is not turn into light energy , but considerably majority of which is transformed into heat. LED light efficiency is currently only 100lm / W, the electro-optical conversion efficiency is only about 20 to 30%. That is about 70% of the electrical energy wasted into heat .

high power LED flood light

Specifically , the junction temperature of especially the high power LED flood light and other power LED light is generated due to two factors .

1 . Internal quantum efficiency is not high , that is, when the electron recombines the hole, which can not produce 100% of all photons, commonly referred to as the ” current leakage ” of carriers leaving the PN zone composite rate. Leakage current times the voltage is the power of this part, which is converted into heat , but this part does not account for the main component , because the internal photon efficiency is close to 90%.

2 . photons Internally generated can not be fully emitted to the outside of the chip and finally converted to the heat, which is the main part , referred to that the external quantum efficiency is currently only about 30% , most of which is converted into the heat .

Although the light efficiency of incandescent is very low , only 15lm / W or so, the considerably majority of the electrical energy light energy is converted into heat , which is that same as the high power LED flood light and other LED lights or other lamps,the rest electricity is converted into light radiated since most of the radiation is infrared therefore very low efficiency, but eliminating the problem of heat dissipation .Browsing http://www.lead-lighting.com/products/sid125-1.htm for more information about the high power LED flood light.

Article from http://www.lighting-ledlight.com/index.php/how-do-the-junction-temperature-of-led-light-generate/

LED lights displayed on Korea Lighting fixtures Fair pocketed the eye

According to KCNA reported that North Korean national lighting and lighting equipment and technology exhibition had published in the University of Kinzer industrial complex held on the 19th to the 20th, various power LED lights such as the commercial LED flood light and large LED screens and other exhibits on display pocketed the eyeball of the participants.

commercial LED flood light

Reported that the production units and technology workers authority and teachers of lighting engineering science departments came to the meeting. Kim Il Sung University, Kinzer industrial university, Pyongyang lighting fixtures plants and other units launched more than 110 kinds of more than 400 pieces of commercial LED flood light and other LED lamps and other lighting sources and stabilizers, published dozens of papers.

Participants shared the the realization of scientific and modern production technology, the achievements and experience on commercial LED flood light and other lighting equipment is to solve the technology problem of. making monumental buildings and people’s cultural and entertainment lighting beautiful in the city.

The report also said Power focus type of commercial LED flood light, a variety of power LED lights and a large LED screens and other exhibits displayed by the DPRK National Academy of Sciences Institute of Machinery, three thousand lighting equipment factory, Daedong River efficient display technology community had pocketed the eyeball of the participant.Browsing http://www.lead-lighting.com/products/bid19-1.htm is to know more about description about the characters and uses of the  commercial LED flood light.

Article from http://www.lighting-ledlight.com/index.php/led-lights-especially-commercial-led-flood-light-displayed-on-korea-lighting-fixtures-fair-pocketed-the-eye/