LED lamps and lanterns heat dissipation and how to judge?

Heat dissipation performance as one of the core performance LED lamps and lanterns, its quality affects the intensity of illumination of lamps and lanterns and the service life, even restrict the LED lamps lighting the success or failure of the project. In this introduction to judge a lamps and lanterns of radiator do very good method. Judge a radiator of lamps and lanterns to do well, the most direct method is to measure the lamps and lanterns to work when the temperature of the LED chip, namely the junction temperature, but it's clearly a theoretical, because when a lamps and lanterns is completed, junction temperature is hidden, that is why need to come to the conclusion that special measurement methods to help determine the cause of the heat dissipation merits. Here, we use quantitative judgment junction temperature of indirect method, to determine the merits of the lamps and lanterns of the radiator. Half an hour of illuminance method measuring the junction temperature although we can't direct measurement of junction temperature, but can be by indirect methods backstepping junction temperature changes. Due to the LED junction temperature rise, high luminous flux will decline. So, only need to measure the intensity of illumination of the lamps and lanterns as in the same position change, can the launch of the junction temperature changes. Practice: 1, choose a place without external light interference, had better be in the evening, turn off the other lights. 2, cold light, measuring a location of the intensity of illumination, immediately write down the readings for the cold illumination. 3, the lamps and lanterns and light meter position unchanged, lamps and lanterns of continuous work. 4, after half an hour, and then read the illuminance values here, write down the readings for the hot intensity of illumination. 5, if the two Numbers about ( 1015%) Basic good, the lamps and lanterns of the cooling system. 6, if the two Numbers are far, More than 20%) , the lamps and lanterns of the cooling system is questionable. In this list several kinds of products the luminous flux vs junction temperature curve of chip, can see from the curve, how many lumen flux decline, and indirectly, that junction temperature rose to how many degrees Celsius. Graph: Mr OSLON SSL 80 White chips, luminous flux 15% lower than 25 ℃, the junction temperature has more than 120 ℃, basic can determine the cooling system is not qualified. Graph: OSRAM E5 ( 5630). Chip, luminous flux decreased by 20% at 25 ℃, junction temperature has more than 140 ℃, basic can determine the cooling system is not qualified. Basic can determine the cooling system is good. Simply by using the above half an hour of illuminance, measure the lamps and lanterns is according to the illumination changes in the same place, can easily through the launch of the junction temperature changes, to judge the merits of the cooling system.
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