LED lamps and lanterns of the cooling performance is good?

With the life of lamps and lanterns, exactly is the problem that how to define and judging on the LED lamps and lanterns to find the answer, it is easy to find, from the appearance of LED lamps and lanterns, could tell at a glance it different from the traditional light source, because almost all of the LED lamps and lanterns has a remarkable features light body with the radiator. And the existence of a variety of radiator, not to the LED lamps and lanterns is beautiful, but in order to make it a better job. So why the previous less conventional light source using a radiator and LED time almost all of the lamps and lanterns is useful to the radiator? Because the light is glowing by thermal radiation, such as tungsten, is by thermal glow, so it is not afraid of hot. And the basic structure of the LED is a semiconductor P - N junction, a slightly higher temperature, the working performance will decline, so the heat dissipation is crucial for the LED. First of all, to look at the LED the composition and principle diagram. LED chip work when fever, we regard the internal PN junction temperature referred to as 'junction temperature ( Tj) 。 In our daily life, LED luminous flux is over by the rise of junction temperature, as shown in figure, the standard values for the junction temperature 25 ℃, the junction temperature to 100 ℃, luminous flux is only about 80%. Moreover, the most important thing is, the service life of LED lamps and lanterns is closely related to the junction temperature. Is the most often encountered in daily life, said LED life 50000 hours, really is a junction temperature control at 85 ℃. Now that the junction temperature of LED lamps and lanterns life plays such an important role, so how to reduce the junction temperature? To look at how the lamps and lanterns of heat dissipation, understand the way the heat dissipation, naturally know how to reduce the junction temperature. Three basic ways of heat transfer: conduction, convection and radiation. But the main pass way of conduction and convection radiator cooling, natural radiation heat of flow. Pass 1, the basic principle of heat conduction, heat from the part of the higher temperature along the object to the low temperature part of the way. Factors that influence the heat transfer for heat dissipation material thermal conductivity, heat dissipation structure caused by the thermal resistance, heat conduction material shape and size. 2, radiation, high temperature object directly to the outside heat emission phenomenon. And the influencing factors of thermal radiation is divided into two kinds: the thermal resistance of surrounding environment and medium ( Main consideration air) ； The characteristics of thermal radiation material itself, Generally darker outward radiation strength, actually radiative transfer is not particularly important, because the temperature of lamps and lanterns is not too high, radiation is not very strong) 。 3, convection, heat transfer by the flow of gas or liquid, the factors influencing heat convection velocity and flow of air. In the LED lamps and lanterns, the radiator in the cost of lamps and lanterns of a large block. Some manufacturers in order to save cost, in the structure of radiator, materials and design on shoddy, resulting in serious after-sales problem of lamps and lanterns. To be specific, such as the traditional aluminum ( The aluminum extrusion, appearance is elongated radiator) Process of radiator, the cost is relatively low, simple process; Die casting, The box mould pressure out of the radiator) Can't oxidation process of radiator, surface treatment, can only use spray paint processing, overall heat dissipation performance is not very ideal. So, exactly how to determine the heat dissipation of lamps and lanterns is good or bad? We use the most traditional way, with the hand to touch the induction temperature lamps and lanterns. The lamps and lanterns is feels hot good or not good? Touch the radiator is very hot, certainly is not good to touch the radiator is very hot, the cooling system must be bad, or the radiator cooling capacity is insufficient, chip heat cannot be distributed in a timely manner; In the structural design of effective cooling area is not enough, either is missing. Touch the lamp body is not very hot, not good when LED lamps and lanterns of normal work, good radiator temperature must be lower, but the low temperature of the radiator are not necessarily good. Good chip, heat conduction, heat enough, feel the temperature is not high. This is a good heat dissipation system, the only drawback is a little waste material. If you have any impurity substrate below, there is no good contact and radiator, heat transfer not to come out, gathered in the chip. Touch not hot outside, but inside the chip would have high temperature. Watched as above all, I hope you in the face of indoor lighting engineering, when choosing LED lamps and lanterns, much of the radiator performance merits attention, not only see the appearance of lamps and lanterns! The merits of the heat dissipation performance, directly affects the service life of LED lamps and lanterns.
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