Single LED white light aging board detected data, and the LED white light detected when assembled into a lamp aging data, is certainly a bit out of. The size of this difference depends on the LED electrical work and lighting design parameters, as well as ambient lighting uses.
Choose what kind of LED lamp beads
This is very important, LED lamp beads quality can be said is a very important factor. Give some examples, in the same wafer 14mil white chip segment represented, to do with ordinary epoxy primer and white glue glue packaging and packaging out of the LED lamp beads, single lights at 30 degrees in the environment, a thousands of hours later, the attenuation data for the light fades to 70%; if the class D low failure glue encapsulation, in the same aging environment, thousands of small-time decline of 45%; if the class C low attenuation glue package, in the same aging environment thousands of small-time decline of 12%; if the class B low attenuation glue package, in the same aging environment, thousands of small-time decline of 3%; if the class a low failure glue, in the same aging environment, thousands of small-time -6% decline.
In general, the thermal conductivity ordinary epoxy resin is very small, so when the lights work when the LED chip, LED chip to emit heat, heat capacity and limited ordinary epoxy resin, so when you are outside from the LED light source measure the temperature of the LED bracket when there are 45 degrees, the temperature of LED chip white light in the center is likely to exceed 80 degrees. LED nodes temperature is actually 80 degrees, then when the LED chips working in the thermostat's temperature, is very languishing, which accelerate the aging of the LED light source.
LED light source working environment temperature
According to the data when a single LED light source aging of view, LED light source is lit if there is only one job, while its environment temperature is 30 degrees, then, a single LED light source holder temperature when working no more than 45 degrees . This time, the Fengyun LED life will be over. If there are 100 LED light source illuminates the work space between them just 11.4mm case, then the temperature of the surrounding stent LED light source lamp heap may not exceed 45 degrees, but those LED lights in the middle of the heap light source may reach a high temperature of 65 degrees. This time, the LED light source is a test. So, those gathered in the middle of the LED light source, the light fades will theoretically faster, while the surrounding heap lamp LED light source, the light fades will be a little slower. However, if the LED lamp beads separated by 25mm or more, then they diverged from each other so the heat will not accumulate, and this time, the temperature of each LED lamp holder should be less than 50 degrees, it is more conducive to the normal operation of the LED.
If the LED in the work environment is relatively cold places, the average temperature throughout the year may be only about 15 degrees or less, and that the LED, the life even longer. Alternatively, when the LED work, next to a small fan blowing, which help disperse the heat, this way of life of the LED is also quite helpful. Anyway, we should know, LED is afraid of the heat, the higher the temperature, the shorter the life of the LED, the lower the temperature, the longer LED life. LED is of course ideal operating temperature between minus 5 to zero. But this is basically impossible.
LED lamp beads work electrical parameter design
According to the results, LED white light at lower drive current, the smaller the heat emission, of course, the smaller the brightness. According to the survey, design solar LED lighting circuit, LED drive current is generally only 5-10mA; the number of lamp beads with large lamps used products, such as 500 or more, or more, the drive current is generally only 10-15mA , and the general popularity of LED lighting applications drive current, only 15-18mA, rarely someone to design more than 20mA of current. The results also show that the drive current of 14mA, and added a cover unventilated inside air temperature reaches 71 degrees under the environment, low decay products, thousands of small-time decline to zero, 2000 a small decline of 3% , which indicates that this low-life white LED lamp used in such an environment has reached its maximum, and then big is it the kind of damage.
Because of aging aging plate with no cooling function, so the heat generated when the LED is not basically work conducted to go outside. It proved this experimentally. Aging board inside air temperature has reached a temperature of 101 degrees, the surface temperature of the cover plate is simply aging 53 degrees, a difference of several tens of degrees. This indicates that the design of the plastic cover has essentially no thermal cooling function. But the general lighting design are taken into account thermal cooling function. So, in conclusion, the design of the electrical parameters of the LED lamp according to the actual situation, if the thermal heat dissipation good lighting, LED drive current to increase the white light that is okay, because the LED lamp bead work produced instant heat can be exported to the outside, there is no damage to the LED, the LED is the best care. Conversely, if the thermal heat dissipation so-so lighting, it is best to have a smaller circuit design, put less heat out.
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